American cockroach vs Periplaneta americana

American cockroach and Periplaneta americana both are nouns.

Word	Noun	Adjective	Verb	Adverb
American cockroach	Yes	No	No	No
Periplaneta americana	Yes	No	No	No

As nouns, American cockroach and Periplaneta americana are synonyms defined as:

American cockroach and Periplaneta americana: large reddish brown free-flying cockroach originally from southern United States but now widely distributed

American cockroach (noun)	Periplaneta americana (noun)
large reddish brown free-flying cockroach originally from southern United States but now widely distributed	large reddish brown free-flying cockroach originally from southern United States but now widely distributed