diaeresis or dieresis /dī-ērˈi-sis or -erˈ/

1. A mark ( ¨ ) placed over a vowel, esp the second of two adjacent ones to show that it is to be pronounced separately, as in naïf
2. A pause or break where the end of the word coincides with the end of a foot (prosody)

• Genoa cake
• genoas
• genocidal
• genocide
• genocides
• Genoese
• Hunterian
• hunter-killer
• hunter-killers
• hunters
• hunter's moon
• hunter's moons
• hunt for
• huntiegowk
• hunting
• hunting-box
• hunting-boxes
• hunting-cap
• hunting-caps
• hunting-cat
• hunting-cats
• hunting-cog
• hunting-cogs
• hunting-crop
• hunting-crops