Knot - In addition to being a unit of speed equal to one nautical mile per hour, "knot" can also refer to a fastening made by tying a piece of string or rope together. Context: I learned how to tie a knot in Boy Scouts. Stern - Besides being the rear part of a ship, "stern" can also mean strict or harsh in manner. Context: The stern teacher reprimanded the student for talking in class. Boom - Apart from being a horizontal spar used to extend the foot of a sail, "boom" can also refer to a period of economic growth or a loud, deep resonant sound. Context 1: The booming construction industry led to a high demand for building materials. Context 2: The thunderous boom of fireworks filled the night sky on New Year's Eve. Hatch - In addition to being an opening in the deck or hull of a ship, "hatch" can also mean to plot or devise a scheme or plan. Context: The group hatched a plan to surprise their friend for his birthday. Anchor - Besides being a heavy device dropped from a ship to keep it from drifting, "anchor" can also refer to something or someone that provides stability or support. Context: His faith acted as an anchor during challenging times.