flunk

As verbs the difference between flank and flunk

is that flank is to attack the flank(s) of something while flunk is of a student, to fail a class; to not pass.

As an adjective flank

is maximum (of speed). Historically faster than full speed (the most a vessel can sustain without excessive engine wear or risk of damage), now frequently used interchangeably. Typically used in an emergency or during an attack (All ahead flank!).

As a noun flank

is the flesh between the last rib and the hip; the side.

As verbs the difference between flunk and plunk

is that flunk is of a student, to fail a class; to not pass while plunk is to drop or throw heavily (onto or into something) so that it makes a sound.

As verbs the difference between flung and flunk

is that flung is simple past of fling while flunk is of a student, to fail a class; to not pass.

As a verb flunk

is (us|ambitransitive) of a student, to fail a class; to not pass.

As a noun flunkee is

(us) one who flunks an academic course.