treaty vs alliance

treaty and alliance both are nouns.

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

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

treaty: a written agreement between two states or sovereigns
alliance: a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim

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

treaty (noun)	alliance (noun)
a written agreement between two states or sovereigns	the act of forming an alliance or confederation
	a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim
	an organization of people (or countries) involved in a pact or treaty
	a connection based on kinship or marriage or common interest
	the state of being allied or confederated