flora vs brierpatch

flora and brierpatch both are nouns.

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

As nouns, brierpatch is a hyponym of flora; that is, brierpatch is a word with a more specific, narrower meaning than flora:

flora (noun)	brierpatch (noun)
(botany) a living organism lacking the power of locomotion	tangled mass of prickly plants
all the plant life in a particular region or period