genus Betula vs birch

genus Betula and birch both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Betula	Yes	No	No	No
birch	Yes	Yes	Yes	No

genus Betula (noun)	birch (noun)
a genus of trees of the family Betulaceae (such as birches)	a switch consisting of a twig or a bundle of twigs from a birch tree; used to hit people as punishment
	any betulaceous tree or shrub of the genus Betula having a thin peeling bark
	hard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood

genus Betula (adjective)	birch (adjective)
	consisting of or made of wood of the birch tree

genus Betula (verb)	birch (verb)
	whip with a birch twig