chopper vs skyhook

chopper and skyhook both are nouns.

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

As nouns, skyhook is a hyponym of chopper; that is, skyhook is a word with a more specific, narrower meaning than chopper:

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

Other hyponyms of chopper include cargo helicopter, shuttle helicopter, single-rotor helicopter.

chopper (noun)	skyhook (noun)
a grounder that bounces high in the air	a hook that is imagined to be suspended from the sky
a butcher's knife having a large square blade	helicopter carrying a reel of steel cable that can be used to lift and transport heavy objects
an aircraft without wings that obtains its lift from the rotation of overhead blades
informal terms for a human `tooth'