• unkatolic,
• uncatholik,
• uncatholick,
• unkatholic,
• uncatholoc,
• uuncatholic,
• uncatolic,
• uncatholiq

• apostate,
• nonbeliever,
• unconformist,
• irreligious,
• untraditional,
• nonconformist,
• unbeliever,
• unconventional,
• unorthodox,
• dissident,
• unethical,
• Unreligious,
• unspiritual,
• heretical.

The adjective form of "uncatholic" is "non-Catholic".

The plural form of "uncatholic" is "uncatholics".

The singular form of the word "uncatholic" is "uncatholic". The word itself does not change when used in singular form.