butacaine vs local anesthetic

butacaine and local anesthetic both are nouns.

Word	Noun	Adjective	Verb	Adverb
butacaine	Yes	No	No	No
local anesthetic	Yes	No	No	No

As nouns, local anesthetic is a hypernym of butacaine; that is, local anesthetic is a word with a broader meaning than butacaine:

butacaine: a white crystalline ester that is applied to mucous membranes as a local anesthetic
local anesthetic: anesthetic that numbs a particular area of the body

Other hypernyms of butacaine include local, local anaesthetic, topical anaesthetic, topical anesthetic.

butacaine (noun)	local anesthetic (noun)
a white crystalline ester that is applied to mucous membranes as a local anesthetic	anesthetic that numbs a particular area of the body