biscuit vs fruit bar

biscuit and fruit bar both are nouns.

Word	Noun	Adjective	Verb	Adverb
biscuit	Yes	No	No	No
fruit bar	Yes	No	No	No

As nouns, fruit bar is a hyponym of biscuit; that is, fruit bar is a word with a more specific, narrower meaning than biscuit:

biscuit: any of various small flat sweet cakes
fruit bar: cookies containing chopped fruits either mixed in the dough or spread between layers of dough then baked and cut in bars

biscuit (noun)	fruit bar (noun)
small round bread leavened with baking-powder or soda	cookies containing chopped fruits either mixed in the dough or spread between layers of dough then baked and cut in bars
any of various small flat sweet cakes