welcome vs greet

welcome is a noun but greet is not a noun.

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

As verbs, greet is a hypernym of welcome; that is, greet is a word with a broader meaning than welcome:

Other hypernyms of welcome include recognise, recognize.

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

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

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