silver-tip vs brown bear

silver-tip and brown bear both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver-tip	Yes	No	No	No
brown bear	Yes	No	No	No

As nouns, brown bear is a hypernym of silver-tip; that is, brown bear is a word with a broader meaning than silver-tip:

silver-tip: powerful brownish-yellow bear of the uplands of western North America
brown bear: large ferocious bear of Eurasia

Other hypernyms of silver-tip include bruin, Ursus arctos.

silver-tip (noun)	brown bear (noun)
powerful brownish-yellow bear of the uplands of western North America	large ferocious bear of Eurasia