mealybug vs coccid insect

mealybug and coccid insect both are nouns.

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

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

mealybug: scalelike plant-eating insect coated with a powdery waxy secretion; destructive especially of fruit trees
coccid insect: scale insects and mealybugs

mealybug (noun)	coccid insect (noun)
scalelike plant-eating insect coated with a powdery waxy secretion; destructive especially of fruit trees	scale insects and mealybugs