Adelges piceae vs adelgid

Adelges piceae and adelgid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Adelges piceae	Yes	No	No	No
adelgid	Yes	No	No	No

As nouns, adelgid is a hypernym of Adelges piceae; that is, adelgid is a word with a broader meaning than Adelges piceae:

Adelges piceae: 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

Adelges piceae (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