skydiver vs parachutist

skydiver and parachutist both are nouns.

Word	Noun	Adjective	Verb	Adverb
skydiver	Yes	No	No	No
parachutist	Yes	No	No	No

As nouns, parachutist is a hypernym of skydiver; that is, parachutist is a word with a broader meaning than skydiver:

skydiver: a person who jumps from a plane and performs various gymnastic maneuvers before pulling the parachute cord
parachutist: a person who jumps from aircraft using a parachute

Other hypernyms of skydiver include parachute jumper, parachuter.

skydiver (noun)	parachutist (noun)
a person who jumps from a plane and performs various gymnastic maneuvers before pulling the parachute cord	a person who jumps from aircraft using a parachute