worsted yarn vs yarn

worsted yarn and yarn both are nouns.

Word	Noun	Adjective	Verb	Adverb
worsted yarn	Yes	No	No	No
yarn	Yes	No	Yes	No

As nouns, yarn is a hypernym of worsted yarn; that is, yarn is a word with a broader meaning than worsted yarn:

worsted yarn: a tightly twisted woolen yarn spun from long-staple wool
yarn: a fine cord of twisted fibers (of cotton or silk or wool or nylon etc.) used in sewing and weaving

Other hypernyms of worsted yarn include thread.

worsted yarn (noun)	yarn (noun)
a tightly twisted woolen yarn spun from long-staple wool	a fine cord of twisted fibers (of cotton or silk or wool or nylon etc.) used in sewing and weaving
	the act of giving an account describing incidents or a course of events

worsted yarn (verb)	yarn (verb)
	tell or spin a yarn