Croton bug vs Blattella germanica

Croton bug and Blattella germanica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Croton bug	Yes	No	No	No
Blattella germanica	Yes	No	No	No

As nouns, Croton bug and Blattella germanica are synonyms defined as:

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

Other synonyms of Croton bug include crotonbug, German cockroach, water bug.

Croton bug (noun)	Blattella germanica (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