plantlet vs plant life

plantlet and plant life both are nouns.

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

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

Other hypernyms of plantlet include flora, plant.

plantlet (noun)	plant life (noun)
a young plant or a small plant	(botany) a living organism lacking the power of locomotion