Cleave
Part of speech: noun
Definition: Flat, smooth surface produced by cleavage, or any similar surface produced by similar techniques, as in glass.
Part of speech: verb
Definition: To split or sever something or as if with a sharp instrument. To break a single crystal (such as a gemstone or semiconductor wafer) along one of its more symmetrical crystallographic planes (often by impact), forming facets on the resulting pieces. To make or accomplish by or as if by cutting: cleave a path through the ice. To pierce or penetrate. To split (a complex molecule) into simpler molecules. Of a crystal, to split along a natural plane of division. To cling, adhere or stick fast to something; used with to or unto. To be faithful.
Rive
Part of speech: noun
Definition: A place torn; a rent; a rift.
Part of speech: verb
Definition: To tear apart by force; to split; to cleave.To pierce or cleave with a weapon.To be split or rent asunder.