plummet

As verbs the difference between plummed and plummet

is that plummed is past tense of plum while plummet is to drop swiftly, in a direct manner; to fall quickly.

As a noun plummet is

a piece of lead attached to a line, used in sounding the depth of water.

In intransitive terms the difference between collapse and plummet

is that collapse is to pass out and fall to the floor or ground, as from exhaustion or other illness; to faint while plummet is to drop swiftly, in a direct manner; to fall quickly.

As nouns the difference between taxonomy and plummet

is that taxonomy is the science or the technique used to make a classification while plummet is (archaic) a piece of lead attached to a line, used in sounding the depth of water.

As a verb plummet is

to drop swiftly, in a direct manner; to fall quickly.

As verbs the difference between plummet and topple

is that plummet is to drop swiftly, in a direct manner; to fall quickly while topple is to push, throw over, overturn or overthrow something.

As a noun plummet

is (archaic) a piece of lead attached to a line, used in sounding the depth of water.