Finnish word avoero comes from Finnish ero, Finnish avo-

Detailed word origin of avoero

Dictionary entry	Language	Definition
ero	Finnish (fin)	Difference, distinction. Discharge, dismissal. Divorce; used as a short form of avioero. Resignation. Rid; in the expression "to get rid of something" (päästä/hankkiutua eroon jostakin).. Separation, parting.
avo-	Finnish (fin)	(medicine) open, dehiscent. Bare- (without clothing in a part of body).. Open-.
avoero	Finnish (fin)	Breakup (separation of an unmarried couple).

Words with the same origin as avoero