yarn vs spun silk

yarn and spun silk both are nouns.

Word	Noun	Adjective	Verb	Adverb
yarn	Yes	No	Yes	No
spun silk	Yes	No	No	No

As nouns, spun silk is a hyponym of yarn; that is, spun silk is a word with a more specific, narrower meaning than yarn:

yarn: a fine cord of twisted fibers (of cotton or silk or wool or nylon etc.) used in sewing and weaving
spun silk: yarn made from silk waste.

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

yarn (verb)	spun silk (verb)
tell or spin a yarn