hygrophyte vs plant life

hygrophyte and plant life both are nouns.

Word	Noun	Adjective	Verb	Adverb
hygrophyte	Yes	No	No	No
plant life	Yes	No	No	No

As nouns, plant life is a hypernym of hygrophyte; that is, plant life is a word with a broader meaning than hygrophyte:

Other hypernyms of hygrophyte include flora, plant.

hygrophyte (noun)	plant life (noun)
a plant that grows in a moist habitat	(botany) a living organism lacking the power of locomotion