measuring worm vs caterpillar

measuring worm and caterpillar both are nouns.

Word	Noun	Adjective	Verb	Adverb
measuring worm	Yes	No	No	No
caterpillar	Yes	No	No	No

As nouns, caterpillar is a hypernym of measuring worm; that is, caterpillar is a word with a broader meaning than measuring worm:

measuring worm: small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae
caterpillar: a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth

measuring worm (noun)	caterpillar (noun)
small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae	a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth