1. Mustiness.

2. To be obliged or necessitated.

3. To grow mouldy and sour.

4. Wine from the grape not fermented.

5. To mako mouldy and sour.

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

• juust,
• mastr,
• musht,
• mosto,
• molst,
• mulit,
• mpost,
• jusat,
• amoust,
• msut,
• mustic,
• mght,
• mosty,
• muiti,
• muisc,
• musi,
• justt,
• myso,
• muct,
• moste

• musette,
• mugshot,
• musty,
• musd,
• mukataa,
• musto,
• musset,
• Maust,
• musket,
• muskat,
• musth,
• muscat.

The adjective form of the word "must" is "musty".

The plural form of the word "must" is "musts".

The singular form of the word "must" is "must". It remains the same in both singular and plural forms.