peace vs peace treaty

peace and peace treaty both are nouns.

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

As nouns, peace and peace treaty are synonyms defined as:

Other synonyms of peace include pacification.

peace (noun)	peace treaty (noun)
a treaty to cease hostilities	a treaty to cease hostilities
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