Merriam-Webster Collegiate Dictionary - communist

 noun  Date: 1840  1. an adherent or advocate of communism  2. capitalized communard  3.  a. capitalized a member of a Communist party or movement  b. often capitalized an adherent or advocate of a Communist government, party, or movement  4. often capitalized one held to engage in left-wing, subversive, or revolutionary activities  • ~ adjective, often capitalized  • ~ic adjective, often capitalized  • ~ically adverb