The incorrectly spelled word is:

suzeranity

The correct spelling is "suzerainty." Suzerainty refers to a situation where one state has political control or influence over another state that is formally independent.

The other options are spelled correctly:

• Nominal: Means existing in name only or being minimal in amount.
• Buddhist: Relates to Buddhism, a religion and philosophy.
• Theocracy: Describes a system of government where religious leaders hold political power.