coalition vs bloc

coalition and bloc both are nouns.

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

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

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

coalition (noun)	bloc (noun)
the union of diverse things into one body or form or group; the growing together of parts	a group of countries in special alliance
an organization of people (or countries) involved in a pact or treaty
the state of being combined into one body