earwig vs insect

earwig and insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
earwig	Yes	No	No	No
insect	Yes	No	No	No

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

earwig: any of numerous insects of the order Dermaptera having elongate bodies and slender many-jointed antennae and a pair of large pincers at the rear of the abdomen
insect: small air-breathing arthropod

earwig (noun)	insect (noun)
any of numerous insects of the order Dermaptera having elongate bodies and slender many-jointed antennae and a pair of large pincers at the rear of the abdomen	small air-breathing arthropod
	a person who has a nasty or unethical character undeserving of respect