announcement vs notice

announcement and notice both are nouns.

Word	Noun	Adjective	Verb	Adverb
announcement	Yes	No	No	No
notice	Yes	No	Yes	No

As nouns, notice is a hyponym of announcement; that is, notice is a word with a more specific, narrower meaning than announcement:

announcement: a public statement containing information about an event that has happened or is going to happen
notice: an announcement containing information about an event

Other hyponyms of announcement include advisory, banns, handout, press release, release, program, programme, wanted notice, wanted poster.

announcement (noun)	notice (noun)
a public statement containing information about an event that has happened or is going to happen	the act of noticing or paying attention
a formal public statement	polite or favorable attention
	a sign posted in a public place as an advertisement
	an announcement containing information about an event
	a request for payment
	advance notification (usually written) of the intention to withdraw from an arrangement of contract
	a short critical review

announcement (verb)	notice (verb)
	make or write a comment on
	express recognition of the presence or existence of, or acquaintance with
	notice or perceive
	discover or determine the existence, presence, or fact of by perception with the eyes