announce vs say

announce is not a noun while say is a noun.

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

As verbs, say is a hypernym of announce; that is, say is a word with a broader meaning than announce:

Other hypernyms of announce include state, tell.

announce (noun)	say (noun)
	the chance to speak

announce (verb)	say (verb)
make known; make an announcement	express in words
foreshadow or presage	report or maintain
announce publicly or officially	speak, pronounce, or utter in a certain way
give the names of	express a supposition
	give instructions to or direct somebody to do something with authority
	communicate or express nonverbally
	recite or repeat a fixed text
	indicate
	state as one's opinion or judgement; declare
	utter aloud
	have or contain a certain wording or form