Comet and Estraterrestrial body

Comet noun - (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit.

Estraterrestrial body and comet are semantically related. In some cases you can use "Estraterrestrial body" instead a noun "Comet".

Estraterrestrial body noun - A natural object existing outside the earth and outside the earth's atmosphere.

Comet and estraterrestrial body are semantically related. Sometimes you can replace term "Comet" with "Estraterrestrial body", this terms are similar.