S1O1N1O1B3U1O1Y4
13 points
SONOBUOY is validvalid
a buoy that detects and transmits underwater sounds [n SONOBUOYS]
a buoy that detects and transmits underwater sounds [n -S]
a buoy that detects and transmits underwater sounds [n SONOBUOYS]
a buoy that detects and transmits underwater sounds [n -S]