The difference between Sight and Vision

When used as nouns, sight means the ability to see, whereas vision means the sense or ability of sight.

When used as verbs, sight means to register visually, whereas vision means to imagine something as if it were to be true.

check bellow for the other definitions of Sight and Vision

Sight as a noun (in the singular):

The ability to see.

Examples:

"He is losing his sight and now can barely read."
Sight as a noun:

The act of seeing; perception of objects by the eye; view.

Examples:

"to gain sight of land"
Sight as a noun:

Something seen.
Sight as a noun:

Something worth seeing; a spectacle, either good or bad.

Examples:

"We went to London and saw all the sights – Buckingham Palace, Tower Bridge, and so on."

"You really look a sight in that ridiculous costume!"
Sight as a noun:

A device used in aiming a projectile, through which the person aiming looks at the intended target.
Sight as a noun:

A small aperture through which objects are to be seen, and by which their direction is settled or ascertained.

Examples:

"the sight of a quadrant"
Sight as a noun (now, _, colloquial):

a great deal, a lot; .

Examples:

"a sight of money"

"This is a darn sight better than what I'm used to at home!"
Sight as a noun:

In a drawing, picture, etc., that part of the surface, as of paper or canvas, which is within the frame or the border or margin. In a frame, the open space, the opening.
Sight as a noun (obsolete):

The instrument of seeing; the eye.
Sight as a noun:

Mental view; opinion; judgment.

Examples:

"In their sight it was harmless."

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Sight as a verb (transitive):

To register visually.
Sight as a verb (transitive):

To get sight of (something).

Examples:

"to sight land from a ship"
Sight as a verb (transitive):

To apply sights to; to adjust the sights of; also, to give the proper elevation and direction to by means of a sight.

Examples:

"to sight a rifle or a cannon"
Sight as a verb (transitive):

To take aim at.

Vision as a noun (uncountable):

The sense or ability of sight.
Vision as a noun (countable):

Something seen; an object perceived visually.
Vision as a noun (countable):

Something imaginary one thinks one sees.

Examples:

"He tried drinking from the pool of water, but realized it was only a vision."
Vision as a noun (countable, by extension):

Something unreal or imaginary; a creation of fancy.
Vision as a noun (countable):

An ideal or a goal toward which one aspires.

Examples:

"He worked tirelessly toward his vision of world peace."
Vision as a noun (countable):

A religious or mystical experience of a supernatural appearance.

Examples:

"He had a vision of the Virgin Mary."
Vision as a noun (countable):

A person or thing of extraordinary beauty.
Vision as a noun (uncountable):

Pre-recorded film or tape; footage.

Vision as a verb (transitive):

To imagine something as if it were to be true.
Vision as a verb (transitive):

To provide with a vision.