The sound /oo/ (I dearly wish I could use a phonetic or phonemic alphabet) can be spelled, in English, in an almost incredible number of ways:
Blue, blew, shoe, lose, cool, fuse, through. Oo is common: loose, booze, choose, moose, goose, noose. Also uCe (where C stands for consonant): accuse, abuse, infuse, allude, intrude, etc.
There is actually some regularity in English spelling--despite all you hear to contrary, here and elsewhere. That was the thread, the principle, in the Spelling textbooks on which I worked in one of my first jobs.
What chaos there is can partly be blamed on Norman scribes who, after the Norman conquest, put some effort into fixing or straightening out English spelling--and only made things worse with their band-aid approach and their frequent failure to properly understand that which they were tampering with.
