syn

As a verb son

is to be (to exist).

As a noun syn is

sight (especially denoting line of sight, the ability to see something particular).

As a proper noun sun

is the star that the Earth revolves around and from which it receives light and warmth.

As a noun sun

is a star, especially when seen as the centre of any single solar system.

As a verb sun

is to expose to the warmth and radiation of the sun.

As an adjective syn is

that has a torsion angle between 0° and 90°.