balsam woolly aphid vs adelgid

balsam woolly aphid and adelgid both are nouns.

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

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

balsam woolly aphid: a variety of adelgid, or small wingless insects that infest and kill firs, especially Balsam Fir and Fraser Fir (Adelges piceae)
adelgid: any of various insects that feed and form galls on conifers

balsam woolly aphid (noun)	adelgid (noun)
a variety of adelgid, or small wingless insects that infest and kill firs, especially Balsam Fir and Fraser Fir (Adelges piceae)	any of various insects that feed and form galls on conifers