bar fly vs juicer

bar fly and juicer both are nouns.

Word	Noun	Adjective	Verb	Adverb
bar fly	Yes	No	No	No
juicer	Yes	No	No	No

As nouns, juicer is a hypernym of bar fly; that is, juicer is a word with a broader meaning than bar fly:

Other hypernyms of bar fly include drinker, imbiber, toper.

bar fly (noun)	juicer (noun)
a drinker who frequents bars	a squeezer with a conical ridged center that is used for squeezing juice from citrus fruit
	a person who drinks alcoholic beverages (especially to excess)