litigation vs proceeding

litigation and proceeding both are nouns.

Word	Noun	Adjective	Verb	Adverb
litigation	Yes	No	No	No
proceeding	Yes	No	No	No

As nouns, proceeding is a hypernym of litigation; that is, proceeding is a word with a broader meaning than litigation:

litigation: a legal proceeding in a court; a judicial contest to determine and enforce legal rights
proceeding: (law) the institution of a sequence of steps by which legal judgments are invoked

Other hypernyms of litigation include legal proceeding, proceedings.

litigation (noun)	proceeding (noun)
a legal proceeding in a court; a judicial contest to determine and enforce legal rights	(law) the institution of a sequence of steps by which legal judgments are invoked