Short /u/ or long /u:/ for words containing oo?

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book /bʊk/
brook /brʊk/
cook /kʊk/
crook /krʊk/
hook /hʊk/
look /lʊk/
rook /rʊk/
rookie /ˈrʊki/
shook /ʃʊk/
took /tʊk/ood
wood
good
stood
soot
wool
https://jakubmarian.com/pronunciation-of-oo-in-english-long-or-short/
The long pronunciation

The vast ma­jor­ity of Eng­lish words con­tain­ing “oo” that we didn’t men­tion above are pro­nounced with a long [uː]. Here they are (ex­cep­tions to the rules men­tioned above are marked with “(!)”):

boom /buːm/
boost /buːst/
boot /buːt/
brood /bruːd/ (!)
choose /tʃuːz/
cool /kuːl/
coot /kuːt/
crooner /ˈkruːnə(r)/
doom /duːm/
drool /druːl/
droop /druːp/
food /fuːd/ (!)
fool /fuːl/
hoop /huːp/
hoot /huːt/
loop /luːp/
loose /luːs/
loot /luːt/
mood /muːd/ (!)
moon /muːn/
moose /muːs/
moot /muːt/
noon /nuːn/
pool /puːl/
proof /pruːf/
root /ruːt/
school /skuːl/
schooner /ˈskuːnə(r)/
scoop /skuːp/
shoot /ʃuːt/
soon /suːn/
spook /spuːk/ (!)
spool /spuːl/
snooker /ˈsnuːkə(r)/ (!)
snooze /snuːz/
stool /stuːl/
stoop /stuːp/
tool /tuːl/
toot /tuːt/
tooth /tuːθ/
troop /truːp/
zoom /zuːm/

Fur­ther­more, all words end­ing with “oo” are pro­nounced with a long [uː], for ex­am­ple,

bamboo /ˌbæmˈbuː/
cuckoo /ˈkʊkuː/
igloo /ˈɪɡluː/
kangaroo /ˌkæŋɡəˈruː/
loo /luː/
shampoo /ʃæmˈpuː/
taboo /təˈbuː/
tattoo /təˈtuː/
too /tuː/
voodoo /ˈvuːduː/

Fi­nally, there are a few words for which both pro­nun­ci­a­tions, [uː] as well as [ʊ], are pos­si­ble, but the vari­ant with the long [uː] is more com­mon, whereas the vari­ant with [ʊ] is pre­sent only in some di­alects:

broom /bruːm/ (less commonly /brʊm/)
groom /ɡruːm/ (less commonly /grʊm/)
hoof /huːf/ (less commonly /hʊf/)
roof /ruːf/ (less commonly /rʊf/)
roomy /ˈruːmi/ (less commonly /ˈrʊmi/)
root /ruːt/ (less commonly /rʊt/)

A some­what spe­cial case is the word room, for which both pro­nun­ci­a­tions are com­mon:

room /ruːm/ or /rʊm/ and -room words, e.g.:bedroom /bɛdruːm/ or /ˈbɛdrʊm/
mushroom /ˈmʌʃruːm/ or /ˈmʌʃrʊm/
…

Other pronunciations

There are a small num­ber of words with yet an­other pro­nun­ci­a­tion of “oo”. There are two words in which “oo” is pro­nounced as [ʌ] (as “u” in “but”):

blood /blʌd/
flood /flʌd/

And sev­eral words where “oo” is pro­nounced as a long “o”:

door /dɔː(r)/
floor /flɔː(r)/
moor /mɔː/ UK, /mɔːr/ US or /mʊə/ UK, /mʊr/ US
poor /pɔː/ UK, /pɔːr/ US or /pʊə/ UK, /pʊr/ US

Fi­nally, it may hap­pen that the two o’s in “oo” be­long to dif­fer­ent syl­la­bles. If this is the case, the first “o” is usu­ally pro­nounced as “oh”, and the other one is pro­nounced as if the first one weren’t there, for ex­am­ple,

cooperate /kəʊˈɒpəreɪt/ UK, /koʊˈɑːpəreɪt/ US
zoologist /zəʊˈɒlədʒɪst/ UK, /zoʊˈɑːlədʒɪst/ US or both with /zuː-/
coordinate /kəʊˈɔːdɪneɪt/ UK, /koʊˈɔːrdɪneɪt/ US (verb; noun with /-nət/)
microorganism /ˌmaɪkrəʊˈɔːɡənɪzəm/ UK, /ˌmaɪkroʊˈɔːrɡənɪzəm/ US