popular front vs coalition

popular front and coalition both are nouns.

Word	Noun	Adjective	Verb	Adverb
popular front	Yes	No	No	No
coalition	Yes	No	No	No

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

popular front: a leftist coalition organized against a common opponent
coalition: an organization of people (or countries) involved in a pact or treaty

Other hypernyms of popular front include alignment, alinement, alliance.

popular front (noun)	coalition (noun)
a leftist coalition organized against a common opponent	the union of diverse things into one body or form or group; the growing together of parts
	an organization of people (or countries) involved in a pact or treaty
	the state of being combined into one body