ended vs over

ended is not a noun while over is a noun.

Word	Noun	Adjective	Verb	Adverb
ended	No	Yes	No	No
over	Yes	Yes	No	Yes

As adjectives, ended and over are synonyms defined as:

Other synonyms of ended include all over, complete, concluded, terminated.

ended (noun)	over (noun)
	(cricket) the division of play during which six balls are bowled at the batsman by one player from the other team from the same end of the pitch

ended (adjective)	over (adjective)
having come or been brought to a conclusion	having come or been brought to a conclusion

ended (adverb)	over (adverb)
	throughout a period of time
	at or to a point across intervening space etc.
	throughout an area
	beyond the top or upper surface or edge; forward from an upright position
	over the entire area