helicopter vs chopper

helicopter and chopper both are nouns.

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

As nouns, helicopter and chopper are synonyms defined as:

helicopter and chopper: an aircraft without wings that obtains its lift from the rotation of overhead blades

Other synonyms of helicopter include eggbeater, whirlybird.

helicopter (noun)	chopper (noun)
an aircraft without wings that obtains its lift from the rotation of overhead blades	a grounder that bounces high in the air
	a butcher's knife having a large square blade
	an aircraft without wings that obtains its lift from the rotation of overhead blades
	informal terms for a human `tooth'