small stuff vs seizing

small stuff and seizing both are nouns.

Word	Noun	Adjective	Verb	Adverb
small stuff	Yes	No	No	No
seizing	Yes	No	No	No

As nouns, seizing is a hyponym of small stuff; that is, seizing is a word with a more specific, narrower meaning than small stuff:

Other hyponyms of small stuff include marline, spun yarn.

small stuff (noun)	seizing (noun)
any light rope used on shipboard	the act of gripping something firmly with the hands (or the tentacles)
	small stuff that is used for lashing two or more ropes together