cochineal vs scale insect

cochineal and scale insect both are nouns.

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

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

cochineal: Mexican red scale insect that feeds on cacti; the source of a red dye
scale insect: small homopterous insect that usually lives and feeds on plants and secretes a protective waxy covering

cochineal (noun)	scale insect (noun)
Mexican red scale insect that feeds on cacti; the source of a red dye	small homopterous insect that usually lives and feeds on plants and secretes a protective waxy covering
a red dyestuff consisting of dried bodies of female cochineal insects