Ploughable is a related term of fecund.

As adjectives the difference between ploughable and fecund

is that ploughable is while fecund is (formal) highly fertile; able to produce offspring.

Unfruitful is a related term of ineffective.

As adjectives the difference between unfruitful and ineffective

is that unfruitful is of or pertaining to not bearing fruit (usually figuratively) while ineffective is not having the desired effect; ineffectual.

In intransitive terms the difference between row and tiff

is that row is to argue noisily while tiff is to quarrel.

As nouns the difference between row and tiff

is that row is a line of objects, often regularly spaced, such as seats in a theatre, vegetable plants in a garden etc while tiff is a small argument; a petty quarrel.

As verbs the difference between row and tiff

is that row is to propel (a boat or other craft) over water using oars while tiff is to quarrel.

As an acronym TIFF is

tagged image file format.

As a proper noun Tiff is

a nickname for Tiffany.

Assumption is a related term of direction.

As nouns the difference between assumption and direction

is that assumption is the act of assuming]], or taking to or upon one's self; the act of [[take up|taking up or adopting while direction is the action of directing; pointing (something) or looking towards.

Ingenious is a related term of humorous.

As adjectives the difference between ingenious and humorous

is that ingenious is displaying genius or brilliance; tending to invent while humorous is full of humor or arousing laughter; funny.

In obsolete terms the difference between try and aim

is that try is fine, excellent while aim is to guess or conjecture.

As an adjective try

is fine, excellent.

As an initialism aim is

aIM; AOL Instant Messenger.

Variegated is a related term of varicoloured.

As adjectives the difference between variegated and varicoloured

is that variegated is streaked, spotted, or otherwise marked with a variety of color; very colorful while varicoloured is (british spelling).

As a verb variegated

is (variegate).

As nouns the difference between demand and fiat

is that demand is the desire to purchase goods and services while fiat is an authoritative command or order to do something; an effectual decree.

As verbs the difference between demand and fiat

is that demand is to request forcefully while fiat is to make (something) happen.

As a proper noun Fiat is

an automobile manufactured by the Italian firm Fiat S.p.A..

As a phrase FIAT is

fix it again Tony, a derogatory slang phrase for Fiat, a backronym.

Improper is a related term of unfitting.

As adjectives the difference between improper and unfitting

is that improper is unsuitable to needs or circumstances; inappropriate; inapt while unfitting is that is not fitting for its purpose.

As a verb improper

is (obsolete|transitive) to appropriate; to limit.

Stimulus is a related term of persuasion.

As nouns the difference between stimulus and persuasion

is that stimulus is while persuasion is persuasion.