splitsville vs dissolution

splitsville and dissolution both are nouns.

Word	Noun	Adjective	Verb	Adverb
splitsville	Yes	No	No	No
dissolution	Yes	No	No	No

As nouns, dissolution is a hypernym of splitsville; that is, dissolution is a word with a broader meaning than splitsville:

splitsville: separation or breakup or divorce
dissolution: the termination or disintegration of a relationship (between persons or nations)

Other hypernyms of splitsville include breakup.

splitsville (noun)	dissolution (noun)
separation or breakup or divorce	the termination or disintegration of a relationship (between persons or nations)
	the termination of a meeting
	dissolute indulgence in sensual pleasure
	separation into component parts
	the process of going into solution