monocarp vs plant life

monocarp and plant life both are nouns.

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

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

Other hypernyms of monocarp include flora, plant.

monocarp (noun)	plant life (noun)
a plant that bears fruit once and dies	(botany) a living organism lacking the power of locomotion