measuring worm vs looper

measuring worm and looper both are nouns.

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

As nouns, measuring worm and looper are synonyms defined as:

measuring worm and looper: small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae

Other synonyms of measuring worm include inchworm.

measuring worm (noun)	looper (noun)
small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae	small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae