Diphthong [əu]

go no so

cold folk ghost sold told post

abode awoke broke coke cope drove hole joke mole note poke pope rode slope smoke spoke stole stroke wardrobe woke

boat cloak coat coach cockroach foam goad load moan oak oath road toad toast

doe foe hoe toe

arrow bungalow barrow elbow follow furrow glow grow low morrow narrow ow pillow rainbow row scarecrow slow sorrow sow tomorrow throw town willow window

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The main problem are the words ending in -ow because this grapheme can also be pronounced [au]