• naturity-onset diabetes,
• katurity-onset diabetes,
• jaturity-onset diabetes,
• mzturity-onset diabetes,
• msturity-onset diabetes,
• mwturity-onset diabetes,
• mqturity-onset diabetes,
• marurity-onset diabetes,
• mafurity-onset diabetes,
• magurity-onset diabetes,
• mayurity-onset diabetes,
• ma6urity-onset diabetes,
• ma5urity-onset diabetes,
• matyrity-onset diabetes,
• mathrity-onset diabetes,
• matjrity-onset diabetes,
• matirity-onset diabetes,
• mat8rity-onset diabetes,
• mat7rity-onset diabetes,
• matueity-onset diabetes

The adjective form of "maturity-onset diabetes" is "maturity-onset diabetic" or "maturity-onset diabetes".

The plural form of "maturity-onset diabetes" would be "maturity-onset diabetes cases" or simply "maturity-onset diabetes".

The singular form of "maturity-onset diabetes" is "maturity-onset diabetes". The word itself is already singular.