Synonyms for Propagandist:

adj.

pert (adjective)
propagandistic.

n.

disseminator (noun)
missionary, zealot, evangelist, teacher, indoctrinator, devotee, salesman, Proselytizer, catechizer, advocate, pamphleteer, advocator.
propagandist (noun)
propagandistic.
spreader of misinformation (noun)
advocator, missionary.

Other synonyms:

partisan
zealot.
Other relevant words:
evangelist, advocate, zealot, advocator, missionary, pamphleteer.