Croton bug vs water bug

Croton bug and water bug both are nouns.

Word	Noun	Adjective	Verb	Adverb
Croton bug	Yes	No	No	No
water bug	Yes	No	No	No

As nouns, Croton bug and water bug are synonyms defined as:

Croton bug and water bug: small light-brown cockroach brought to United States from Europe; a common household pest

Other synonyms of Croton bug include Blattella germanica, crotonbug, German cockroach.

Croton bug (noun)	water bug (noun)
small light-brown cockroach brought to United States from Europe; a common household pest	a true bug: large aquatic bug adapted to living in or on the surface of water
	small light-brown cockroach brought to United States from Europe; a common household pest