As nouns the difference between rain and ran

is that rain is condensed water falling from a cloud while ran is yarns coiled on a spun-yarn winch.

As verbs the difference between rain and ran

is that rain is to have rain fall from the sky while ran is simple past of run.

As a proper noun RAN is

Royal Australian Navy.

As a noun rain

is .

As a proper noun rin is

rhine.

As nouns the difference between rain and gain

is that rain is while gain is the act of gaining or gain can be (architecture) a square or bevelled notch cut out of a girder, binding joist, or other timber which supports a floor beam, so as to receive the end of the floor beam.

As a preposition gain is

(obsolete) against.

As an adjective gain is

(obsolete) straight, direct; near; short.

As an adverb gain is

(obsolete) straightly; quickly; by the nearest way or means.

As a verb gain is

to acquire possession of what one did not have before.

As nouns the difference between rain and ruin

is that rain is while ruin is .

In intransitive terms the difference between rain and grain

is that rain is to fall in large quantities while grain is to form grains, or to assume a granular form, as the result of crystallization; to granulate.

In transitive terms the difference between rain and grain

is that rain is to issue (something) in large quantities while grain is to make granular; to form into grains.

As nouns the difference between rain and grain

is that rain is condensed water falling from a cloud while grain is the harvested seeds of various grass food crops eg: wheat, corn, barley.

As verbs the difference between rain and grain

is that rain is to have rain fall from the sky while grain is to feed grain to.

As nouns the difference between rain and main

is that rain is while main is .

As a noun rain

is condensed water falling from a cloud.

As a verb rain

is to have rain fall from the sky.

As an adjective vain is

overly proud of oneself, especially concerning appearance; having a high opinion of one's own accomplishments with slight reason.

As nouns the difference between rain and drain

is that rain is while drain is a conduit allowing liquid to flow out of an otherwise contained volume.

As a verb drain is

to lose liquid.

As verbs the difference between rain and fain

is that rain is to have rain fall from the sky while fain is to be delighted or glad; to rejoice.

As a noun rain

is condensed water falling from a cloud.

As an adjective fain is

well-pleased; glad; apt; wont; fond; inclined.

As an adverb fain is

with joy; gladly.

As nouns the difference between rain and raid

is that rain is condensed water falling from a cloud while raid is a hostile or predatory incursion; an inroad or incursion of mounted men; a sudden and rapid invasion by a cavalry force; a foray.

As verbs the difference between rain and raid

is that rain is to have rain fall from the sky while raid is to engage in a raid.

As an acronym RAID is

a redundant array of inexpensive disks, or, less frequently restated as a redundant array of independent disks.