Thrust :: Thrust (n.) The force or pressure of one part of a construction against other parts; especially (Arch.), a horizontal or diagonal outward pressure, as of an arch against its abutments, or of rafters against the wall which support them..
Thrust :: Thrust (n.) The breaking down of the roof of a gallery under its superincumbent weight.
Thruster :: Thruster (n.) One who thrusts or stabs.