Zoo cocoon cartoon balloon school snooze bedroom shampoo droop loose
utau. oo-TAH-oo
The word "swoon" has the same "oo" sound as the word "moon."
The word "school" has the same "oo" sound as "loophole," "pull," and "do."
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There are four phonemes in the word "school": /s/, /k/, /oo/, /l/.
The word "book" has the same middle sound as the "oo" in school, cook, or moon.
-oo--
Neither. It is a short OO word as in good and foot.
The word pull has the short OO sound as in good and wood. The O in do has a long OO sound.
Neither. The OO has a long OO (long U) sound as in doom and broom.
It never sounds like "you" because the double oo sound has no y-glide.
It makes a oo sound for example the word uber is prononced oo-ber