idioglossia /id-i-ō-glosˈi-ə/

1. A condition in which pronunciation is so bad as to be quite unintelligible
2. A private language developed between two or more children, esp twins, etc

• speech-songs
• speech synthesis
• speech therapies
• speech therapist
• speech therapists
• speech therapy
• speech-training
• speechwriter
• speechwriters
• speed
• speedball
• speedballing
• speedballings
• speedballs
• speedboat
• speedboating
• speedboatings
• speedboats
• speed bump
• speed bumps
• speed cam
• speed camera
• speed cameras
• speed cop
• speed cops