burl vs slub

burl and slub both are nouns.

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

As nouns, burl and slub are synonyms defined as:

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

Other synonyms of burl include knot.

burl (noun)	slub (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

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