brushwood vs flora

brushwood and flora both are nouns.

Word	Noun	Adjective	Verb	Adverb
brushwood	Yes	No	No	No
flora	Yes	No	No	No

As nouns, flora is a hypernym of brushwood; that is, flora is a word with a broader meaning than brushwood:

Other hypernyms of brushwood include botany, vegetation.

brushwood (noun)	flora (noun)
a dense growth of bushes	(botany) a living organism lacking the power of locomotion
the wood from bushes or small branches	all the plant life in a particular region or period