foregone conclusion vs ending

foregone conclusion and ending both are nouns.

Word	Noun	Adjective	Verb	Adverb
foregone conclusion	Yes	No	No	No
ending	Yes	No	No	No

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

Other hypernyms of foregone conclusion include conclusion, finish.

foregone conclusion (noun)	ending (noun)
something that is certain	the act of ending something
an inevitable ending	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