skyhook vs helicopter

skyhook and helicopter both are nouns.

Word	Noun	Adjective	Verb	Adverb
skyhook	Yes	No	No	No
helicopter	Yes	No	No	No

As nouns, helicopter is a hypernym of skyhook; that is, helicopter is a word with a broader meaning than skyhook:

skyhook: helicopter carrying a reel of steel cable that can be used to lift and transport heavy objects
helicopter: an aircraft without wings that obtains its lift from the rotation of overhead blades

Other hypernyms of skyhook include chopper, eggbeater, whirlybird.

skyhook (noun)	helicopter (noun)
a hook that is imagined to be suspended from the sky	an aircraft without wings that obtains its lift from the rotation of overhead blades
helicopter carrying a reel of steel cable that can be used to lift and transport heavy objects