pact vs peace treaty

pact and peace treaty both are nouns.

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

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

Other hyponyms of pact include alliance, commercial treaty, pacification, peace, convention.

pact (noun)	peace treaty (noun)
a written agreement between two states or sovereigns	a treaty to cease hostilities