spun yarn vs small stuff

spun yarn and small stuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
spun yarn	Yes	No	No	No
small stuff	Yes	No	No	No

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

spun yarn: (nautical) small stuff consisting of a lightweight rope made of several rope yarns loosely wound together
small stuff: any light rope used on shipboard

spun yarn (noun)	small stuff (noun)
(nautical) small stuff consisting of a lightweight rope made of several rope yarns loosely wound together	any light rope used on shipboard