Select the option that can be used as a one-word substitute for the given group of words.

One who believes in the existence of a god or gods

Theist

The one-word substitute for one who believes in the existence of a god or gods is theist.

• Linguist is a person who studies or specializes in language.
• Atheist is a person who does not believe in the existence of a god or gods.
• Theist is a person who believes in the existence of a god or gods.
• Leftist is a person who holds political views that favor social equality and social justice.

Theist is the most appropriate word for this group of words because it specifically refers to someone who believes in the existence of a god or gods. The other words do not have the same connotation of religious belief.