sun

As a noun subatmosphere is

the lower part of an atmosphere, especially that of the sun.

As an adjective solunar is

of, pertaining to, or influenced by both the sun and the moon.

As a noun spectromagnetograph is

(physics|astronomy) an instrument that measures the vectors and velocities of the magnetic fields on the surface of the sun.

As a proper noun nibiru is

a supposed planet in a highly elliptic orbit around the sun.

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 Phoebean is

of or relating to Phoebe or Phoebus.

As a noun shamash is

(judaism) the candle used to light the other eight candles of a hanukkah menorah