announce vs herald

announce is not a noun while herald is a noun.

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

As verbs, announce and herald are synonyms defined as:

Other synonyms of announce include annunciate, foretell, harbinger.

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

announce (verb)	herald (verb)
make known; make an announcement	foreshadow or presage
foreshadow or presage	praise vociferously
announce publicly or officially	greet enthusiastically or joyfully
give the names of