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)

• collective agreements
• collective bargaining
• collective farm
• collective farms
• collective fruit
• collective fruits
• collectively
• collective noun
• collective nouns
• collective responsibility
• collectives
• collective securities
• collective security
• collective unconscious
• collectivisation
• comprinting
• comprints
• comprisable
• comprisal
• comprisals
• comprise
• comprised
• comprises
• comprising
• compromise