knot

noun

1
a sandpiper that breeds in the Arctic and winters in the southern hemisphere
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
soft lump or unevenness in a yarn; either an imperfection or created by design
4
a tight cluster of people or things
a small knot of women listened to his sermon
the bird had a knot of feathers forming a crest
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
something twisted and tight and swollen
their muscles stood out in knots
the old man's fists were two great gnarls
7
a hard cross-grained round piece of wood in a board where a branch emerged
the saw buckled when it hit a knot

Also useful for “knot”:Scrabble— High-value letters — see what it scores