blackbeetle vs cockroach

blackbeetle and cockroach both are nouns.

Word	Noun	Adjective	Verb	Adverb
blackbeetle	Yes	No	No	No
cockroach	Yes	No	No	No

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

blackbeetle: 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 blackbeetle include roach.

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