Teaching oi and oy Words in Australian Phonics
Oi and oy both spell the vowel diphthong — but position determines which to use. Oi in the middle, oy at the end or before a vowel. A simple rule that covers nearly every word students will meet.
Used by teachers in NSW · VIC · QLD · WA · SA · ACT
The phonics concept
Understanding oi and oy
One diphthong phoneme, two spellings determined by position. Teaching the positional rule early prevents the most common student error: using oy mid-word and oi at the end of words.
The oi/oy pattern: position determines the spelling
Both oi and oy represent the same diphthong phoneme, but they appear in different positions. Oi appears in the medial position of a syllable, before a consonant: oil, coin, join, point, voice, soil, foil, moist, loin, coil. Oy appears at the end of a word or syllable, or immediately before a vowel: boy, toy, joy, enjoy, royal, loyal, destroy, oyster, annoy, voyage. The positional rule is reliable and parallels the ai/ay pattern, making it straightforward to teach explicitly once students are familiar with that earlier pattern.
Teaching sequence: oi first, then oy
Introduce oi before oy because oi is more positionally consistent and appears in a slightly greater number of common early-reading words. Start with oil, coin, and join, then extend to point, soil, foil, voice, and moist. Once students can reliably read and spell simple oi words, introduce oy as the word-final alternate. Contrast pairs are useful: coin/boy, soil/toy, join/joy. These show that both spellings map to the same phoneme in different positions. After word-final oy is established, introduce the pre-vowel oy pattern in royal, loyal, and oyster.
Australian English pronunciation note
Australian English produces the /oi/ diphthong with a starting point that is closer to /oh/ than the /aw/ onset used in Standard American English. Students will naturally produce the Australian variant, which is entirely correct. Teachers do not need to adjust student pronunciation toward an American model. When using audio resources, ensure they feature Australian-accented voices so students hear the phoneme as they naturally produce it. SoundSnapp uses Australian-accented ElevenLabs audio throughout so this is handled automatically.
Year-level guidance and curriculum alignment
The oi/oy diphthong is typically introduced in Year 1 after short vowel patterns, CVC blending, and initial consonant digraphs are secure. It forms part of the vowel diphthong strand alongside the ou/ow diphthong. Year 2 students extend to multisyllabic oy words (enjoy, destroy, royal) and consolidate the positional rule across a wider word set. By Year 3, students are expected to apply both spellings automatically in reading and writing. The Australian Curriculum: English addresses vowel diphthongs as part of the phonics and word knowledge strand from Year 1.
Word lists
oi and oy Words at a Glance
Two groups: oi in medial position, oy at the end of a word or before a vowel. Teach each group as a distinct set, in order.
oi
/oi/ diphthong
Medial position (before a consonant) — the default spelling mid-word
oy
/oi/ diphthong
Word-final or before a vowel — the word-end spelling
Practice modes
How SoundSnapp Supports oi and oy Teaching
Diphthong Tiles at /play
SoundSnapp's practice modes include oi and oy phoneme tiles. Students hear Australian-accented audio and select the correct diphthong tile, building both phoneme discrimination and grapheme knowledge. No logins, any device, free forever.
- Separate oi and oy phoneme tiles
- Australian-accented ElevenLabs audio throughout
- Hear & Find mode for diphthong word discrimination
- Covers medial oi and final oy patterns
- No logins or setup required
Assessment Mode
Tracks phoneme accuracy in oi/oy diphthong words for each student, identifying those who have not yet secured the positional rule and need additional practice.
- Per-student oi/oy diphthong accuracy data
- Identifies confusion between oi and oy positions
- Progress tracking across diphthong sequence
- Progress data across sessions
- 7-day free trial
Pricing
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Whiteboard Mode
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- Whiteboard Mode for whole-class teaching
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Questions & answers
Frequently Asked Questions
When do you use oi vs oy?
The main positional rule is: oi appears in the middle of a word or syllable (before a consonant), while oy appears at the end of a word or syllable, or before a vowel. Words like oil, coin, join, point, voice, soil, foil, and moist follow the medial oi pattern. Words like boy, toy, joy, destroy, and royal follow the word-final or pre-vowel oy pattern. Teaching the positional rule explicitly covers the vast majority of cases students will encounter in early reading. The rule is parallel to the ai/ay positional split, which makes it easier to generalise once that pattern is secure.
How is the oi/oy sound pronounced in Australian English?
In Australian English, the /oi/ diphthong starts with a vowel that is noticeably closer to a centralised or back vowel compared to Standard American English. Australian speakers begin the diphthong from a position closer to /oh/ and glide toward /ee/, whereas American speakers typically begin from a more open /aw/ position. This means Australian students may produce a slightly different onset when reading oi and oy words aloud, and this is correct for their dialect. Teachers do not need to correct toward an American model. The important phonological fact is that oi and oy represent a single diphthong phoneme regardless of the accent-level realisation.
What oi and oy words should I teach first?
For oi, begin with oil, coin, and join because they are short, transparent, and common in oral language. Add soil, foil, and point once the basic pattern is secure. Voice and moist introduce consonant clusters after oi and work well as the next step. For oy, begin with boy, toy, and joy because they are one-syllable, high frequency, and phonetically clean. Enjoy and destroy introduce the pattern in a multisyllabic context and are good extension words. Royal and loyal introduce oy in a non-final, pre-vowel position and should be taught after the word-final oy pattern is solid. Oyster is useful because it puts oy before a vowel and starts with a vowel itself.
Related phonics topics
Build confident oi and oy knowledge across Year 1–3.
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