declivity

Declivity is a related term of plunge.

As nouns the difference between declivity and plunge

is that declivity is (geomorphology) the downward slope of a hill while plunge is the act of plunging or submerging.

As a verb plunge is

(label) to thrust into water, or into any substance that is penetrable; to immerse.

Slant is a related term of declivity.

As nouns the difference between slant and declivity

is that slant is a slope or incline while declivity is (geomorphology) the downward slope of a hill.

As a verb slant

is to lean, tilt or incline.

Drop is a synonym of declivity.

As nouns the difference between drop and declivity

is that drop is a small mass of liquid just large enough to hold its own weight via surface tension, usually one that falls from a source of liquid while declivity is (geomorphology) the downward slope of a hill.

As a verb drop

is to fall in droplets (of a liquid).

Descent is a related term of declivity.

As nouns the difference between descent and declivity

is that descent is an instance of descending while declivity is (geomorphology) the downward slope of a hill.

As nouns the difference between taxonomy and declivity

is that taxonomy is the science or the technique used to make a classification while declivity is (geomorphology) the downward slope of a hill.

As a noun declivity

is the downward slope of a hill.

As an adjective downsteepy is

having a great declivity.