As nouns the difference between force and necessitation

is that force is force while necessitation is (chiefly|philosophy) necessity, understood as a logical or other philosophical principle, or as a law or force of nature.

As a proper noun nature

is the sum of natural forces reified and considered as a sentient being, will, or principle.

As a noun necessitation is

(chiefly|philosophy) necessity, understood as a logical or other philosophical principle, or as a law or force of nature.

Necessitate is a related term of necessitation.

As a verb necessitate

is to make necessary; to require (something) to be brought about.

As a noun necessitation is

(chiefly|philosophy) necessity, understood as a logical or other philosophical principle, or as a law or force of nature.

As nouns the difference between impoverishment and necessitousness

is that impoverishment is the action of impoverishing someone while necessitousness is the state or condition of impoverishment; material need, especially of an urgent nature.

As nouns the difference between material and necessitousness

is that material is material (matter which may be shaped or manipulated) while necessitousness is the state or condition of impoverishment; material need, especially of an urgent nature.

As nouns the difference between need and necessitousness

is that need is a requirement for something while necessitousness is the state or condition of impoverishment; material need, especially of an urgent nature.

As a verb need

is to be necessary (to someone).

As an adjective urgent

is requiring immediate attention.

As a noun necessitousness is

the state or condition of impoverishment; material need, especially of an urgent nature.

As nouns the difference between circumstance and necessitude

is that circumstance is that which attends, or relates to, or in some way affects, a fact or event; an attendant thing or state of things while necessitude is (rare) the state or characteristic of being in need; neediness.

As a verb circumstance

is to place in a particular situation, especially with regard to money or other resources.

As nouns the difference between event and necessitude

is that event is blowhole (of cetaceans) while necessitude is (rare) the state or characteristic of being in need; neediness.

As nouns the difference between unavoidable and necessitude

is that unavoidable is something that cannot be avoided while necessitude is (rare) the state or characteristic of being in need; neediness.

As an adjective unavoidable

is impossible to avoid; bound to happen.