anticlimax vs ending

anticlimax and ending both are nouns.

Word	Noun	Adjective	Verb	Adverb
anticlimax	Yes	No	No	No
ending	Yes	No	No	No

As nouns, ending is a hypernym of anticlimax; that is, ending is a word with a broader meaning than anticlimax:

Other hypernyms of anticlimax include close, closing, conclusion, end.

anticlimax (noun)	ending (noun)
a change from a serious subject to a disappointing one	the act of ending something
a disappointing decline after a previous rise	the end of a word (a suffix or inflectional ending or final morpheme)
	the last section of a communication
	event whose occurrence ends something
	the point in time at which something ends