cotton candy vs candyfloss

cotton candy and candyfloss both are nouns.

Word	Noun	Adjective	Verb	Adverb
cotton candy	Yes	No	No	No
candyfloss	Yes	No	No	No

As nouns, cotton candy and candyfloss are synonyms defined as:

cotton candy and candyfloss: a candy made by spinning sugar that has been boiled to a high temperature

Other synonyms of cotton candy include spun sugar.

cotton candy (noun)	candyfloss (noun)
a candy made by spinning sugar that has been boiled to a high temperature	a candy made by spinning sugar that has been boiled to a high temperature