The difference between Gain and Minus

When used as nouns, gain means the act of gaining, whereas minus means a minus sign (−).

When used as prepositions, gain means against, whereas minus means without.

When used as verbs, gain means to acquire possession of, whereas minus means to subtract.

When used as adjectives, gain means straight, direct, whereas minus means negative.

Gain is also adverb with the meaning: straightly.

check bellow for the other definitions of Gain and Minus

Gain as an adjective (obsolete):

Straight, direct; near; short.

Examples:

"the gainest way "
Gain as an adjective (obsolete):

Suitable; convenient; ready.
Gain as an adjective (dialectal):

Easy; tolerable; handy, dexterous.
Gain as an adjective (dialectal):

Honest; respectable; moderate; cheap.

Gain as an adverb (obsolete):

Straightly; quickly; by the nearest way or means.
Gain as an adverb (dialectal):

Suitably; conveniently; dexterously; moderately.
Gain as an adverb (dialectal):

Tolerably; fairly.

Examples:

"gain quiet (= fairly/pretty quiet)"

Gain as a noun:

The act of gaining; acquisition.
Gain as a noun:

What is gained.
Gain as a noun (electronics):

The factor by which a signal is multiplied.

Gain as a verb (transitive):

To acquire possession of.

Examples:

"Looks like you've gained a new friend."
Gain as a verb (intransitive):

To have or receive advantage or profit; to acquire gain; to grow rich; to advance in interest, health, or happiness; to make progress.

Examples:

"The sick man gains daily."
Gain as a verb (transitive, dated):

To come off winner or victor in; to be successful in; to obtain by competition.

Examples:

"to gain a battle; to gain a case at law"
Gain as a verb (transitive):

To increase.
Gain as a verb (intransitive):

To be more likely to catch or overtake an individual.

Examples:

"I'm gaining (on you)."

"[[gain ground]]"
Gain as a verb (transitive):

To reach.

Examples:

"to gain the top of a mountain"
Gain as a verb:

To draw into any interest or party; to win to one's side; to conciliate.
Gain as a verb (intransitive):

To put on weight.

Examples:

"I've been gaining."
Gain as a verb (of a clock or watch):

To run fast.

Gain as a noun (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.

Minus as a preposition (informal):

Without.

Examples:

"I walked out minus my coat''."

"synonyms: lacking without"
Minus as a preposition (mathematics):

less; reduced by.

Examples:

"seven minus two is five"

"ant plus"

Minus as an adjective (mathematics):

Negative.

Examples:

"a minus number"
Minus as an adjective:

On the negative part of a scale.

Examples:

"minus seven degrees"
Minus as an adjective (postpositive):

Ranking just below a designated rating.

Examples:

"He got a grade of B minus for his essay."