terminus ad quem vs ending

terminus ad quem and ending both are nouns.

Word	Noun	Adjective	Verb	Adverb
terminus ad quem	Yes	No	No	No
ending	Yes	No	No	No

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

Other hypernyms of terminus ad quem include end.

terminus ad quem (noun)	ending (noun)
final or latest limiting point	the act of ending something
	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