diaphone /dīˈə-fōn/

1. A siren-like fog signal
2. A bass reed-organ stop made louder by vibrating material
3. All the variants of a phoneme

• upsold
• upspake
• upspeak
• upspeaking
• upspeaks
• upspear
• upspeared
• upspearing
• upspears
• upspoke
• upspoken
• upsprang
• upspring
• upspringing
• upsprings
• upsprung
• upstage
• upstaged
• upstages
• upstaging
• upstair
• upstairs
• upstand
• upstanding
• upstands