overthrow vs ending

overthrow and ending both are nouns.

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

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

Other hypernyms of overthrow include conclusion, termination.

overthrow (noun)	ending (noun)
the termination of a ruler or institution (especially by force)	the act of ending something
the act of disturbing the mind or body	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

overthrow (verb)	ending (verb)
rule against
cause the downfall of; of rulers