ShortDiphthong (oi/oy) word family
-oy Words
/ɔɪ/ — words that share the -oy pattern
Oi and oy spell the same diphthong, /ɔɪ/, following the same positional pattern as ai/ay and oa/ow: oi is used in the middle of a word, such as coin and oil, while oy is used at the end of a word, such as boy and toy.
How the -oy family works
Keep the ending -oy together, then add or change the beginning sound. Read through the whole word from left to right instead of guessing from its first letter.
3 reviewed examples
-oy word list
Begin with the shorter words. Add the second group only after blends and digraphs in those words have been taught.
Start here
A speaker appears only where a reviewed recording is currently available. Every listed spelling has still been checked for the target pattern.
Teach the right examples first
Why this -oy pattern is useful
Introduce the word "diphthong"
Unlike the vowel teams taught so far, oi/oy is a true diphthong: the vowel sound glides from one position to another rather than staying level.
Teach the position rule directly
The same oi-middle, oy-end pattern used for ai/ay and oa/ow applies here: oi appears mid-word, oy appears at the end.
Keep the core list small and accurate
Boy, toy, and joy are the clearest, most common -oy words. A short, accurate list teaches the pattern better than a padded one.
Contrast with an oi word every time
Pairing boy with coin, or toy with oil, keeps the position rule visible and previews the mid-word spelling.
Listening check
Listen and choose the -oy word
Question 1 of 3
Now read the same words aloud and use one in a sentence.
Explore another familyMove into connected text
Read -oy words in sentences
1The boy has a toy.
2It brings me joy.
3Enjoy the toy, boy.
4The joy was clear on his face.
5A boy chose a toy.
Ask the learner to underline the -oy word, decode it, and then reread the complete sentence naturally.
Spelling and pronunciation
Keep this family accurate
A diphthong is a vowel sound that glides from one position to another within the same syllable. Keep oy as one smooth glide, /ɔɪ/, rather than two separate vowel sounds.
A common question
What is the difference between oi and oy?
Oi and oy spell the same diphthong, /ɔɪ/. Oi is used in the middle of a word, as in coin, oil, and boil. Oy is used at the end of a word, as in boy, toy, and joy. This follows the same position rule as ai/ay and oa/ow.
Five-minute routine
Practise without memorizing the list
Cover the list and reveal one word at a time. Say each sound, blend, then reread the word normally.
Build boy, then exchange its first sound to make another real word from this page.
Read one sentence, dictate one target word, and ask the learner to explain which letters spell the shared ending.
Ready-to-print practice
Print this -oy word lesson
The print layout keeps the reviewed word list, sentences, contrast, and practice routine while removing navigation and audio controls.