greet vs say farewell

greet and say farewell both are verbs.

Word	Noun	Adjective	Verb	Adverb
greet	No	No	Yes	No
say farewell	No	No	Yes	No

As verbs, say farewell is a hyponym of greet; that is, say farewell 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, welcome, bid, wish.

greet (verb)	say farewell (verb)
react to in a certain way	say good-bye or bid farewell
express greetings upon meeting someone
send greetings to
be perceived by