stinging hair vs tomentum

stinging hair and tomentum both are nouns.

Word	Noun	Adjective	Verb	Adverb
stinging hair	Yes	No	No	No
tomentum	Yes	No	No	No

As nouns, tomentum is a hypernym of stinging hair; that is, tomentum is a word with a broader meaning than stinging hair:

stinging hair: a multicellular hair in plants like the stinging nettle that expels an irritating fluid
tomentum: filamentous hairlike growth on a plant

Other hypernyms of stinging hair include fuzz, hair.

stinging hair (noun)	tomentum (noun)
a multicellular hair in plants like the stinging nettle that expels an irritating fluid	a network of tiny blood vessels between the cerebral surface of the pia mater and the cerebral cortex
	filamentous hairlike growth on a plant