Gravity is a synonym of staidness.

As nouns the difference between gravity and staidness

is that gravity is resultant force on earth's surface, of the attraction by the earth's masses, and the centrifugal pseudo-force caused by the earth's rotation while staidness is the state or characteristic of being staid.

Father is a related term of propagate.

As a proper noun father

is (christianity) god, the father of creation.

As a verb propagate is

to cause to continue or multiply by generation, or successive production; -- applied to animals and plants; as, to propagate a breed of horses or sheep; to propagate a species of fruit tree.

As adjectives the difference between decorous and mannerly

is that decorous is marked by proper behavior while mannerly is polite, having good manners.

As nouns the difference between demonstration and expression

is that demonstration is the act of demonstrating; showing or explaining something while expression is a particular way of phrasing an idea.

Struggle is a related term of shindy.

As nouns the difference between struggle and shindy

is that struggle is strife, contention, great effort while shindy is a shindig.

As a verb struggle

is to strive, to labour in difficulty, to fight (for'' or ''against ), to contend.

As verbs the difference between forecast and presuppose

is that forecast is to estimate how something will be in the future while presuppose is to assume some truth without proof, usually for the purpose of reaching a conclusion based on that truth.

As a noun forecast

is an estimation of a future condition.

Willingness is a related term of alertness.

As nouns the difference between willingness and alertness

is that willingness is the state of being willing while alertness is the quality of being alert or on the alert; briskness; nimbleness; activity.

Swarm is a related term of jumble.

As nouns the difference between swarm and jumble

is that swarm is a large number of insects, especially when in motion or (for bees) migrating to a new colony while jumble is a mixture of unrelated things.

As verbs the difference between swarm and jumble

is that swarm is (lb) to move as a swarm while jumble is to mix or confuse.

Plea is a related term of announcement.

As a verb plea

is to fold, fold up, double.

As a noun announcement is

an act of announcing, or giving notice.

As nouns the difference between air and essence

is that air is the atmospheric substance above the surface of the earth which animals breathe, formerly considered to be a single substance, one of the four basic elements of ancient philosophy and one of the five basic elements of Eastern traditions while essence is (inherent nature)The inherent nature of a thing or idea.

As a verb air

is to bring (something) into contact with the air, so as to freshen or dry it.