The difference between Plain and Rich

When used as verbs, plain means to complain, whereas rich means to enrich.

When used as adjectives, plain means flat, level, whereas rich means wealthy: having a lot of money and possessions.

Plain is also noun with the meaning: a lamentation.

Plain is also adverb with the meaning: simply.

check bellow for the other definitions of Plain and Rich

Plain as an adjective (now, _, rare, regional):

Flat, level.
Plain as an adjective (of food):

Simple. Ordinary; lacking adornment or ornamentation; unembellished. Of just one colour; lacking a pattern. Simple in habits or qualities; unsophisticated, not exceptional, ordinary. Having only few ingredients, or no additional ingredients or seasonings; not elaborate, without toppings or extras. Containing no extended or nonprinting characters (especially in ).

Examples:

"He was dressed simply in plain black clothes."

"a plain tune"

"a plain pink polycotton skirt"

"They're just plain people like you or me."

"Would you like a poppy bagel or a plain bagel?"
Plain as an adjective:

Obvious. Evident to one's senses or reason; manifest, clear, unmistakable. Downright; total, unmistakable (as intensifier).

Examples:

"His answer was just plain nonsense."
Plain as an adjective:

Open. Honest and without deception; candid, open; blunt. Clear; unencumbered; equal; fair.

Examples:

"Let me be plain with you: I don't like her."
Plain as an adjective:

Not unusually beautiful; unattractive.

Examples:

"Throughout high school she worried that she had a rather plain face."

Plain as an adverb (colloquial):

Simply

Examples:

"It was just plain stupid."

"I plain forgot."

Plain as a verb (reflexive, obsolete):

To complain.
Plain as a verb (ambitransitive, now, rare, poetic):

To lament, bewail.

Examples:

"to plain a loss"

"rfquotek Sir J. Harrington"

Plain as a verb (obsolete, transitive):

To level; to raze; to make plain or even on the surface.
Plain as a verb (obsolete, transitive):

To make plain or manifest; to explain.

Rich as an adjective:

Wealthy: having a lot of money and possessions.
Rich as an adjective:

Having an intense fatty or sugary flavour.

Examples:

"a rich dish; rich cream or soup; rich pastry"
Rich as an adjective:

Plentiful, abounding, abundant, fulfilling.

Examples:

"a rich treasury; a rich entertainment; a rich crop"
Rich as an adjective:

Yielding large returns; productive or fertile; fruitful.

Examples:

"rich soil or land; a rich mine"
Rich as an adjective:

Composed of valuable or costly materials or ingredients; procured at great outlay; highly valued; precious; sumptuous; costly.

Examples:

"a rich dress; rich silk or fur; rich presents"
Rich as an adjective:

Not faint or delicate; vivid.

Examples:

"a rich red colour"
Rich as an adjective (informal, dated):

Very amusing.

Examples:

"The scene was a rich one."

"a rich incident or character"

"rfquotek Thackeray"
Rich as an adjective (informal):

Ridiculous, absurd.
Rich as an adjective (computing):

Elaborate, having complex formatting, multimedia, or depth of interaction.
Rich as an adjective:

Of a fuel-air mixture, having less air than is necessary to burn all of the fuel; less air- or oxygen- rich than necessary for a stoichiometric reaction.

Rich as a verb (obsolete, transitive):

To enrich.

Examples:

"rfquotek Gower"

"rfquotek Shakespeare"
Rich as a verb (obsolete, intransitive):

To become rich.