ski cap vs toboggan cap

ski cap and toboggan cap both are nouns.

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

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

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

Other synonyms of ski cap include stocking cap.

ski cap (noun)	toboggan 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