dwarf planet

Translations
карликовая планета
Pluto is classified as a dwarf planet.
Плутон классифицируется как карликовая планета.
Definitions
A dwarf planet is a celestial body that orbits the Sun, is spherical in shape due to its own gravity, has not cleared its neighboring region of other objects, and is not a satellite. Examples include Pluto, Eris, and Haumea.
Words
dwarf

adjective
карликовая
planet

noun
планета