saskatoon vs berry

saskatoon and berry both are nouns.

Word	Noun	Adjective	Verb	Adverb
saskatoon	Yes	No	No	No
berry	Yes	No	Yes	No

As nouns, berry is a hypernym of saskatoon; that is, berry is a word with a broader meaning than saskatoon:

saskatoon: edible purple or red berries
berry: any of numerous small and pulpy edible fruits; used as desserts or in making jams and jellies and preserves

saskatoon (noun)	berry (noun)
edible purple or red berries	any of numerous small and pulpy edible fruits; used as desserts or in making jams and jellies and preserves
	a small fruit having any of various structures, e.g., simple (grape or blueberry) or aggregate (blackberry or raspberry)

saskatoon (verb)	berry (verb)
	pick or gather berries