betel pepper vs true pepper

betel pepper and true pepper both are nouns.

Word	Noun	Adjective	Verb	Adverb
betel pepper	Yes	No	No	No
true pepper	Yes	No	No	No

As nouns, true pepper is a hypernym of betel pepper; that is, true pepper is a word with a broader meaning than betel pepper:

betel pepper: Asian pepper plant whose leaves are chewed with betel nut (seed of the betel palm) by southeast Asians
true pepper: any of various shrubby vines of the genus Piper

Other hypernyms of betel pepper include pepper vine.

betel pepper (noun)	true pepper (noun)
Asian pepper plant whose leaves are chewed with betel nut (seed of the betel palm) by southeast Asians	any of various shrubby vines of the genus Piper