1. Mohammedanism.

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

• islams,
• islamis,
• islamism,
• islamics,
• islamist,
• endamism,
• uslamism,
• jslamism,
• kslamism,
• islanism,
• islaamism,
• islimism,
• muslumism,
• weisemannism,
• ismaliism,
• Ismaalism,
• dissamis,
• Islaamisim,
• Islaamizam,
• Islaamizm

• islamabad,
• Islamise,
• Islamic law,
• Islamize,
• islam,
• islamic,
• Islamist.

The adjective form of the word "islamism" is "Islamist".

The plural form of the word "islamism" is "islamisms".

The singular form of the word "islamism" is "islamist"