peace vs armistice

peace and armistice both are nouns.

Word	Noun	Adjective	Verb	Adverb
peace	Yes	No	No	No
armistice	Yes	No	No	No

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

peace: the state prevailing during the absence of war
armistice: a state of peace agreed to between opponents so they can discuss peace terms

Other hyponyms of peace include amity, cease-fire, truce, conciliation, collective security, Pax Romana.

peace (noun)	armistice (noun)
a treaty to cease hostilities	a state of peace agreed to between opponents so they can discuss peace terms
the absence of mental stress or anxiety
the state prevailing during the absence of war
harmonious relations; freedom from disputes
the general security of public places