plummet (n.)
- bate
 - bob
 - break
 - cascade
 - cataract
 - collapse
 - crash
 - cut
 - decline
 - decrease
 - deflation
 - depreciation
 - devaluation
 - dip
 - dive
 - down
 - drop
 - dump
 - ebb
 - fall
 - lead
 - lower
 - lowering
 - parachute
 - pare
 - pitch
 - plop
 - plumb
 - plump
 - plunge
 - plunk
 - pounce
 - precipitate
 - rain
 - reduction
 - sag
 - sandbag
 - shave
 - shrink
 - sink
 - sinker
 - skid
 - skin-dive
 - slash
 - slump
 - soar
 - sound
 - square
 - stoop
 - swoop
 - trim
 - tumble
 - wane
 - waste
 - wear
 - weight
 
plummet (v.)
- abate
 - ablate
 - bate
 - bob
 - break
 - cascade
 - cheapen
 - collapse
 - consume
 - corrode
 - crash
 - crumble
 - cut
 - decline
 - decrease
 - deflate
 - deliquesce
 - depreciate
 - descend
 - devaluate
 - diminish
 - dip
 - dive
 - down
 - drop
 - dump
 - dwindle
 - ebb
 - erode
 - fall
 - gravitate
 - languish
 - lead
 - lessen
 - lower
 - parachute
 - pare
 - pitch
 - plop
 - plumb
 - plump
 - plunge
 - plunk
 - pounce
 - precipitate
 - rain
 - reduce
 - sag
 - sandbag
 - shave
 - shrink
 - sink
 - skid
 - skin-dive
 - slash
 - slump
 - soar
 - sound
 - square
 - stoop
 - subside
 - swoop
 - trim
 - tumble
 - wane
 - waste
 - wear
 - weight
 
Deeper than e'er plummet sounded.