skyhook vs whirlybird

skyhook and whirlybird both are nouns.

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

As nouns, whirlybird is a hypernym of skyhook; that is, whirlybird 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
whirlybird: an aircraft without wings that obtains its lift from the rotation of overhead blades

Other hypernyms of skyhook include chopper, eggbeater, helicopter.

skyhook (noun)	whirlybird (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