What do phobos and deimos mean?

Deimos, in my opinion, has the same etymological root as demon, and Phobos provides us with the suffixes for many phobias, such as hydrophobia.

The names of the planets are derived from Roman deities. Specifically, Mars, the god of war, was named after the Greek god Ares, while Venus, the goddess of love, was named after the Greek goddess Aphrodite. When the two moons of Mars were found, they were named Phobos and Deimos, after the twin sons of Ares and Aphrodite.

Both Phobos and Deimos are believed to be captured asteroids. Phobos is believed to be in close orbit around Mars and is expected to either crash into Mars or break up into smaller pieces that will form a ring around the planet in about 50 million years.

Mars has two moons: Phobos, which in Greek mythology means "fear" or "panic," and Deimos, which means "terror" or "dread."