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

• psychogas
• psychogases
• psychogeneses
• psychogenesis
• psychogenetic
• psychogenetical
• psychogenetics
• psychogenic
• psychogeriatric
• psychogeriatrician
• psychogeriatrics
• psychogonies
• psychogony
• psychogram
• psychograms
• psychograph
• psychographic
• psychographical
• psychographics
• psychographies
• psychographs
• psychography
• psychohistorian
• psychohistorians
• psychohistorical