subplanetary

As a noun terms

is .

As an adjective subplanetary is

(astronomy) describing bodies smaller than a planet.

As a noun star

is star.

As an adjective subplanetary is

(astronomy) describing bodies smaller than a planet.

In astronomy terms the difference between planet and subplanetary

is that planet is a body which orbits the Sun directly and is massive enough to be in hydrostatic equilibrium (effectively meaning a spheroid) and to dominate its orbit; specifically, the eight major bodies of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. (Pluto was considered a planet until 2006 and has now been reclassified as a dwarf planet. while subplanetary is describing the point on the surface of a star directly underneath a close planet.

As a noun planet

is each of the seven major bodies which move relative to the fixed stars in the night sky—the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn.

As an adjective subplanetary is

describing bodies smaller than a planet.