Blatta orientalis vs cockroach

Blatta orientalis and cockroach both are nouns.

Word	Noun	Adjective	Verb	Adverb
Blatta orientalis	Yes	No	No	No
cockroach	Yes	No	No	No

As nouns, cockroach is a hypernym of Blatta orientalis; that is, cockroach is a word with a broader meaning than Blatta orientalis:

Blatta orientalis: dark brown cockroach originally from orient now nearly cosmopolitan in distribution
cockroach: any of numerous chiefly nocturnal insects; some are domestic pests

Other hypernyms of Blatta orientalis include roach.

Blatta orientalis (noun)	cockroach (noun)
dark brown cockroach originally from orient now nearly cosmopolitan in distribution	any of numerous chiefly nocturnal insects; some are domestic pests