anesthetic vs insensible

anesthetic is a noun but insensible is not a noun.

Word	Noun	Adjective	Verb	Adverb
anesthetic	Yes	Yes	No	No
insensible	No	Yes	No	No

anesthetic (noun)	insensible (noun)
a drug that causes temporary loss of bodily sensations

anesthetic (adjective)	insensible (adjective)
relating to or producing insensibility	incapable of physical sensation
characterized by insensibility	barely able to be perceived
	unresponsive to stimulation
	unaware of or indifferent to