1. A reactionary.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• eeactionist,
• deactionist,
• feactionist,
• teactionist,
• 5eactionist,
• 4eactionist,
• rwactionist,
• rsactionist,
• rdactionist,
• rractionist,
• r4actionist,
• reactioonist,
• reactionsit,
• reactionnist,
• reactioniist,
• reactionisst,
• reactionistt,
• reactionnists,
• reactionists,
• Reactionsists

• reactant,
• reactionism,
• reactance,
• reaction,
• reaction time,
• reactionary.

The adjective form of "reactionist" is "reactionary".

The plural form of the word "reactionist" is "reactionists"

The singular form of the word "reactionist" is "reactionist".