pine leaf aphid vs adelgid

pine leaf aphid and adelgid both are nouns.

Word	Noun	Adjective	Verb	Adverb
pine leaf aphid	Yes	No	No	No
adelgid	Yes	No	No	No

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

pine leaf aphid: a variety of adelgid which feeds on red, black, Engelmann, blue, and white spruce, or alternatively on white and western white pines (Pineus pinifoliae)
adelgid: any of various insects that feed and form galls on conifers

pine leaf aphid (noun)	adelgid (noun)
a variety of adelgid which feeds on red, black, Engelmann, blue, and white spruce, or alternatively on white and western white pines (Pineus pinifoliae)	any of various insects that feed and form galls on conifers