As nouns the difference between communalism and communist
is that communalism is the communal ownership of property while communist is a member of a (nominally) communist party.
As an adjective communist is
relating to a (nominally) communist party.
communist
English
Adjective
(head)
Of, relating to, supporting, or advocating communism.
Noun
(
en noun)
An advocate of a society based on the common ownership of property; a proponent of communism.
(nonstandard) Any revolutionary or subversive radical.