anesthetic agent vs anaesthetic agent

anesthetic agent and anaesthetic agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
anesthetic agent	Yes	No	No	No
anaesthetic agent	Yes	No	No	No

As nouns, anesthetic agent and anaesthetic agent are synonyms defined as:

anesthetic agent and anaesthetic agent: a drug that causes temporary loss of bodily sensations

Other synonyms of anesthetic agent include anaesthetic, anesthetic.

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