rowanberry vs fruit

rowanberry and fruit both are nouns.

Word	Noun	Adjective	Verb	Adverb
rowanberry	Yes	No	No	No
fruit	Yes	No	Yes	No

As nouns, fruit is a hypernym of rowanberry; that is, fruit is a word with a broader meaning than rowanberry:

rowanberry (noun)	fruit (noun)
decorative red berrylike fruit of a rowan tree	an amount of a product
	the consequence of some effort or action
	the ripened reproductive body of a seed plant

rowanberry (verb)	fruit (verb)
	bear fruit
	cause to bear fruit