Noun
A person who makes knots.
A machine or device that makes knots.
(pulp and paper) A screen used to remove “knots” or impurities from wood pulp in the process of making paper.
(nautical, in compounds) A vessel capable of reaching a specified speed in knots.
(nautical, in compounds) A wind blowing at a specified velocity in knots.
Source: en.wiktionary.org