slub vs burl

slub and burl both are nouns.

Word	Noun	Adjective	Verb	Adverb
slub	Yes	No	No	No
burl	Yes	No	Yes	No

As nouns, slub and burl are synonyms defined as:

slub and burl: soft lump or unevenness in a yarn; either an imperfection or created by design

Other synonyms of slub include knot.

slub (noun)	burl (noun)
soft lump or unevenness in a yarn; either an imperfection or created by design	soft lump or unevenness in a yarn; either an imperfection or created by design
	a large rounded outgrowth on the trunk or branch of a tree
	the wood cut from a tree burl or outgrowth; often used decoratively in veneer

slub (verb)	burl (verb)
	remove the burls from cloth