ornamental vs flora

ornamental and flora both are nouns.

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

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

Other hypernyms of ornamental include plant, plant life.

ornamental (noun)	flora (noun)
any plant grown for its beauty or ornamental value	(botany) a living organism lacking the power of locomotion
	all the plant life in a particular region or period

ornamental (adjective)	flora (adjective)
serving an esthetic rather than a useful purpose