show business vs show biz

show business and show biz both are nouns.

Word	Noun	Adjective	Verb	Adverb
show business	Yes	No	No	No
show biz	Yes	No	No	No

As nouns, show business and show biz are synonyms defined as:

show business and show biz: those involved in providing entertainment: radio and television and films and theater

Other synonyms of show business include entertainment industry.

show business (noun)	show biz (noun)
those involved in providing entertainment: radio and television and films and theater	those involved in providing entertainment: radio and television and films and theater