greet vs welcome

greet is not a noun while welcome is a noun.

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

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

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

greet (noun)	welcome (noun)
	a greeting or reception
	the state of being welcome

greet (adjective)	welcome (adjective)
	giving pleasure or satisfaction or received with pleasure or freely granted

greet (verb)	welcome (verb)
react to in a certain way	bid welcome to; greet upon arrival
express greetings upon meeting someone	receive someone, as into one's house
send greetings to	accept gladly
be perceived by