shower stall vs cubicle

shower stall and cubicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
shower stall	Yes	No	No	No
cubicle	Yes	No	No	No

As nouns, cubicle is a hypernym of shower stall; that is, cubicle is a word with a broader meaning than shower stall:

Other hypernyms of shower stall include booth, kiosk, stall.

shower stall (noun)	cubicle (noun)
booth for washing yourself, usually in a bathroom	small area set off by walls for special use
	small individual study area in a library
	small room in which a monk or nun lives