Periplaneta americana vs American cockroach

Periplaneta americana and American cockroach both are nouns.

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

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

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

Periplaneta americana (noun)	American cockroach (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