toboggan cap vs ski cap

toboggan cap and ski cap both are nouns.

Word	Noun	Adjective	Verb	Adverb
toboggan cap	Yes	No	No	No
ski cap	Yes	No	No	No

As nouns, toboggan cap and ski cap are synonyms defined as:

toboggan cap and ski cap: a close-fitting woolen cap; often has a tapering tail with a tassel

Other synonyms of toboggan cap include stocking cap.

toboggan cap (noun)	ski cap (noun)
a close-fitting woolen cap; often has a tapering tail with a tassel	a close-fitting woolen cap; often has a tapering tail with a tassel