Yes, knot is a Scrabble word!

Verb

1. Make into knots; make knots out of

2. Tie or fasten into a knot

3. Tangle or complicate

Noun

1. A tight cluster of people or things

2. Any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object

3. A hard cross-grained round piece of wood in a board where a branch emerged

4. Something twisted and tight and swollen

5. A unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude

6. Soft lump or unevenness in a yarn; either an imperfection or created by design

7. A sandpiper that breeds in the Arctic and winters in the southern hemisphere