A machine for forcing a pile, a long beam, into the ground as part of the construction of a foundation; usually by raising a weight and then dropping it on the beam.

forceful

A marine fish, Naucrates ductor, that often follows large vessels and sharks.

(slang) A clergyman, especially a military chaplain or padre.

A pilot trained in using and assigned to pilot a fighter plane.

A drug, such as mifepristone (Mifegyne), used to terminate a pregnancy in its earliest stage.

(transitive) To form a pile, stack, or heap. / (idiomatic, intransitive) To collect or accumulate, as a backlog.

A pile of crashed vehicles due to a traffic accident. / (American football) A pile of tackling players. / An accumulation that occurs over time, especially one which is not welcome.

(physics) an early nuclear reactor fuelled by uranium and moderated with graphite

A narrow hole drilled or punched into a surface, to facilitate the insertion of a wider screw, nail, drill bit, or other boring tool.