inchworm vs looper

inchworm and looper both are nouns.

Word	Noun	Adjective	Verb	Adverb
inchworm	Yes	No	No	No
looper	Yes	No	No	No

As nouns, inchworm and looper are synonyms defined as:

inchworm 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 inchworm include measuring worm.

inchworm (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