proclamation vs announcement

proclamation and announcement both are nouns.

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

As nouns, proclamation and announcement are synonyms defined as:

Other synonyms of proclamation include annunciation, declaration.

proclamation (noun)	announcement (noun)
the formal act of proclaiming; giving public notice	a public statement containing information about an event that has happened or is going to happen
a formal public statement	a formal public statement