What's the difference between slub and slubber?

Slub

Definition:

• (n.) A roll of wool slightly twisted; a rove; -- called also slubbing.
• (v. t.) To draw out and twist slightly; -- said of slivers of wool.

Example Sentences:

Slubber

Definition:

• (v. t.) To do lazily, imperfectly, or coarsely.
• (v. t.) To daub; to stain; to cover carelessly.
• (n.) A slubbing machine.

Example Sentences: