umlaut /ŭmˈlowt/

1. A vowel change in Germanic languages brought about by a vowel or semivowel (esp i or j, usu now lost) in the following syllable
2. The diacritical sign (¨), dots placed over a vowel, indicating such a modification

To modify (a vowel) with an umlaut

• national anthems
• National Assembly
• National Assistance
• national bank
• national banks
• national call
• national calls
• national church
• national churches
• national code
• National Convention
• National Curriculum
• National Curriculum Council
• national debt
• national debts
• National Front
• national grid
• national grids
• National Guard
• National Guards
• National Health Service
• National Hunt
• national income
• national incomes
• national insurance