sky dive vs skydive

sky dive and skydive both are verbs.

Word	Noun	Adjective	Verb	Adverb
sky dive	No	No	Yes	No
skydive	No	No	Yes	No

As verbs, sky dive and skydive are synonyms defined as:

sky dive and skydive: jump from an airplane and perform various maneuvers before opening one's parachute

sky dive (verb)	skydive (verb)
jump from an airplane and perform various maneuvers before opening one's parachute	jump from an airplane and perform various maneuvers before opening one's parachute