ʊ

English spelling of the IPA ʊ sound: Usually oo or ou.
The ʊ sound is like the IPA uː sound, but shorter.

book, cook, good, room, foot, look, took, wood, hook, hood, stood
(but not too, cool, food, mood, moon, pool, school, roof, route, root, boot)
could, would, should

put, pull, push, cushion, full, bull, pudding, pussycat
(but not but, dull, hush, rush, bud, fuss, etc)

cook, cool

pull, pool

full, fool

good, food

room, school

wooden spoon

school route (both long)

good cook (both short)