fuzz vs stinging hair

fuzz and stinging hair both are nouns.

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

As nouns, stinging hair is a hyponym of fuzz; that is, stinging hair is a word with a more specific, narrower meaning than fuzz:

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

Other hyponyms of fuzz include beard.

fuzz (noun)	stinging hair (noun)
the first beard of an adolescent boy	a multicellular hair in plants like the stinging nettle that expels an irritating fluid
a hazy or indistinct representation
uncomplimentary terms for a policeman
filamentous hairlike growth on a plant