scale insect vs coccid insect

scale insect and coccid insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
scale insect	Yes	No	No	No
coccid insect	Yes	No	No	No

As nouns, coccid insect is a hypernym of scale insect; that is, coccid insect is a word with a broader meaning than scale insect:

scale insect: small homopterous insect that usually lives and feeds on plants and secretes a protective waxy covering
coccid insect: scale insects and mealybugs

scale insect (noun)	coccid insect (noun)
small homopterous insect that usually lives and feeds on plants and secretes a protective waxy covering	scale insects and mealybugs