These are the oi and oy digraphs
They are both pronounced as /oi/
When this sound is at the beginning or in the middle of a word oi is used (e.g. ointment or point)
When the sound is at the end of a word oy is used (e.g. soy or toy)
Word List
oi
choice
voice
rejoice
android
avoid
spoil
spoilt
toilet
ointment
joint
point
appointment
disappoint
anoint
noise
poison
-oy
annoyance
royalty
convoy
destoy
employment
enjoy
voyage
oyster
boycott
disloyal
boyfriend