1. Tautological.

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

• rautologous,
• fautologous,
• gautologous,
• yautologous,
• 6autologous,
• 5autologous,
• tzutologous,
• tsutologous,
• twutologous,
• tqutologous,
• taytologous,
• tahtologous,
• tajtologous,
• taitologous,
• ta8tologous,
• ta7tologous,
• taurologous,
• taufologous,
• taugologous,
• tauyologous

• autologous,
• pathological,
• tautologies,
• phonological,
• ontological,
• epistemological,
• tautology,
• analogous,
• topological,
• methodological.

The adjective form of the word "Tautologous" is "tautological".

The plural form of "tautologous" is "tautologous".

The singular form of the word "Tautologous" is "Tautology"