woolly aphid vs aphid

woolly aphid and aphid both are nouns.

Word	Noun	Adjective	Verb	Adverb
woolly aphid	Yes	No	No	No
aphid	Yes	No	No	No

As nouns, aphid is a hypernym of woolly aphid; that is, aphid is a word with a broader meaning than woolly aphid:

woolly aphid: secretes a waxy substance like a mass of fine curly white cotton or woolly threads
aphid: any of various small plant-sucking insects

woolly aphid (noun)	aphid (noun)
secretes a waxy substance like a mass of fine curly white cotton or woolly threads	any of various small plant-sucking insects