chopper vs helicopter

chopper and helicopter both are nouns.

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

As nouns, chopper and helicopter are synonyms defined as:

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

Other synonyms of chopper include eggbeater, whirlybird.

chopper (noun)	helicopter (noun)
a grounder that bounces high in the air	an aircraft without wings that obtains its lift from the rotation of overhead blades
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'