alliance vs coalition

alliance and coalition both are nouns.

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

As nouns, alliance and coalition are synonyms defined as:

alliance and coalition: an organization of people (or countries) involved in a pact or treaty

Other synonyms of alliance include alignment, alinement.

As nouns, coalition is a hypernym of alliance; that is, coalition is a word with a broader meaning than alliance:

Other hypernyms of alliance include fusion.

alliance (noun)	coalition (noun)
the act of forming an alliance or confederation	the union of diverse things into one body or form or group; the growing together of parts
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
an organization of people (or countries) involved in a pact or treaty	the state of being combined into one body
a connection based on kinship or marriage or common interest
the state of being allied or confederated