greet vs curtsy

greet is not a noun while curtsy is a noun.

Word	Noun	Adjective	Verb	Adverb
greet	No	No	Yes	No
curtsy	Yes	No	Yes	No

As verbs, curtsy is a hyponym of greet; that is, curtsy is a word with a more specific, narrower meaning than greet:

greet: express greetings upon meeting someone
curtsy: make a curtsy; usually done only by girls and women; as a sign of respect

Other hyponyms of greet include shake hands, bob, salute, present, salute, salute, hail, herald, receive, welcome, say farewell, bid, wish.

greet (noun)	curtsy (noun)
	bending the knees; a gesture of respect made by women

greet (verb)	curtsy (verb)
react to in a certain way	make a curtsy; usually done only by girls and women; as a sign of respect
express greetings upon meeting someone	bend the knees in a gesture of respectful greeting
send greetings to
be perceived by