flog vs birch

flog is not a noun while birch is a noun.

Word	Noun	Adjective	Verb	Adverb
flog	No	No	Yes	No
birch	Yes	Yes	Yes	No

As verbs, birch is a hyponym of flog; that is, birch is a word with a more specific, narrower meaning than flog:

Other hyponyms of flog include flagellate, scourge, leather, horsewhip, switch, cowhide, cat.

flog (noun)	birch (noun)
	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

flog (adjective)	birch (adjective)
	consisting of or made of wood of the birch tree

flog (verb)	birch (verb)
beat severely with a whip or rod	whip with a birch twig
beat with a cane