Customary is a related term of plain.

As nouns the difference between customary and plain

is that customary is a book containing laws and usages, or customs; a custumal while plain is (rare|poetic) a lamentation or plain can be an expanse of land with relatively low relief.

As adjectives the difference between customary and plain

is that customary is agreeing with, or established by, custom; established by common usage; conventional; habitual while plain is .

As an adverb plain is

(colloquial) simply.

As a verb plain is

to lament, bewail or plain can be (obsolete|transitive) to plane or level; to make plain or even on the surface.

Canon is a related term of sway.

As nouns the difference between canon and sway

is that canon is while sway is the act of swaying; a swaying motion; a swing or sweep of a weapon.

As a verb sway is

to move or swing from side to side; or backward and forward; to rock.

Inhumane is a related term of relentless.

As adjectives the difference between inhumane and relentless

is that inhumane is lacking pity or compassion for misery and suffering; cruel, unkind, not humane while relentless is unrelenting or unyielding in severity.

Mortification is a related term of disgust.

As nouns the difference between mortification and disgust

is that mortification is the act of mortifying while disgust is an intense dislike or loathing someone feels for something bad or nasty.

As a verb disgust is

to cause an intense dislike for something.

Light is a synonym of short.

As proper nouns the difference between light and short

is that light is while short is .

Discourage is a related term of cow.

As a verb discourage

is to extinguish the courage of; to dishearten; to depress the spirits of; to deprive of confidence; to deject.

As a noun discourage

is lack of courage.

As an acronym cow is

(computing).

In obsolete terms the difference between journey and coast

is that journey is a day's work while coast is to conduct along a coast or river bank.

As nouns the difference between journey and coast

is that journey is a set amount of travelling, seen as a single unit; a discrete trip, a voyage while coast is the side or edge of something.

As verbs the difference between journey and coast

is that journey is to travel, to make a trip or voyage while coast is to glide along without adding energy.

Frightful is a related term of unspeakable.

As adjectives the difference between frightful and unspeakable

is that frightful is (obsolete): full of fright; affrighted; frightened while unspeakable is incapable of being spoken or uttered; unutterable; ineffable; inexpressible.

Expeditious is a related term of expert.

As an adjective expeditious

is fast, prompt, speedy.

As a noun expert is

(label) rate assessor.

Lively is a related term of humorous.

As a proper noun lively

is .

As an adjective humorous is

full of humor or arousing laughter; funny.