German cockroach vs crotonbug

German cockroach and crotonbug both are nouns.

Word	Noun	Adjective	Verb	Adverb
German cockroach	Yes	No	No	No
crotonbug	Yes	No	No	No

As nouns, German cockroach and crotonbug are synonyms defined as:

German cockroach and crotonbug: small light-brown cockroach brought to United States from Europe; a common household pest

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

German cockroach (noun)	crotonbug (noun)
small light-brown cockroach brought to United States from Europe; a common household pest	small light-brown cockroach brought to United States from Europe; a common household pest