greet vs herald

greet is not a noun while herald is a noun.

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

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

greet (noun)	herald (noun)
	something that precedes and indicates the approach of something or someone
	(formal) a person who announces important news

greet (verb)	herald (verb)
react to in a certain way	foreshadow or presage
express greetings upon meeting someone	praise vociferously
send greetings to	greet enthusiastically or joyfully
be perceived by