ending vs morpheme

ending and morpheme both are nouns.

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

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

ending: the end of a word (a suffix or inflectional ending or final morpheme)
morpheme: minimal meaningful language unit; it cannot be divided into smaller meaningful units

ending (noun)	morpheme (noun)
the act of ending something	minimal meaningful language unit; it cannot be divided into smaller meaningful units
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