conspiracist

[kuh n-spir-uh-sist]

noun

a person who believes in or supports a conspiracy theory.

Also called con·spir·a·to·ri·al·ist [kuh n-spir-uh-tawr-ee-uh-list, ‐tohr-] /kənˌspɪr əˈtɔr i ə lɪst, ‐toʊr-/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019