ski cap vs stocking cap

ski cap and stocking cap both are nouns.

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

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

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

Other synonyms of ski cap include toboggan cap.

ski cap (noun)	stocking 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