disagreement

Fallingout is likely misspelled.

Fallingout has no English definition.

As a noun disagreement

is an argument or debate.

Variance is a synonym of disagreement.

As nouns the difference between disagreement and variance

is that disagreement is an argument or debate while variance is the act of varying or the state of being variable.

As nouns the difference between disagreement and contention

is that disagreement is an argument or debate while contention is struggle, contest, strife, argument, debate.

As nouns the difference between rejection and disagreement

is that rejection is the act of rejecting while disagreement is an argument or debate.

As nouns the difference between dissolution and disagreement

is that dissolution is the termination of an organized body or legislative assembly, especially a formal dismissal while disagreement is an argument or debate.

As nouns the difference between disagreeable and disagreement

is that disagreeable is something displeasing; anything that is disagreeable while disagreement is an argument or debate.

As an adjective disagreeable

is not agreeable, conformable, or congruous; contrary; unsuitable.

As nouns the difference between disagreement and discongruity

is that disagreement is an argument or debate while discongruity is incongruity; disagreement; unsuitableness.

As nouns the difference between disagreement and headshaking

is that disagreement is an argument or debate while headshaking is the act of shaking one's head, in disagreement or disapproval.

As nouns the difference between disagreement and nonagreement

is that disagreement is an argument or debate while nonagreement is absence of agreement; disagreement, discord.

As an adjective nonagreement is

not of or pertaining to an agreement.

As nouns the difference between disagreement and predisagreement

is that disagreement is an argument or debate while predisagreement is a pause or utterance indicating disagreement to the listener before any disagreeing statement is made.