whirlybird vs helicopter

whirlybird and helicopter both are nouns.

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

As nouns, whirlybird and helicopter are synonyms defined as:

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

Other synonyms of whirlybird include chopper, eggbeater.

whirlybird (noun)	helicopter (noun)
an aircraft without wings that obtains its lift from the rotation of overhead blades	an aircraft without wings that obtains its lift from the rotation of overhead blades