radar

noun 0.672

passive

noun 0.662

radarscope

noun 0.651

radar reflector

noun 0.634

passive defense

noun 0.631

passive voice

noun 0.593

radio telemetry

noun 0.542

radome

noun 0.535

radio alarm

noun 0.535

radio astronomy

noun 0.534

radio beacon

noun 0.532

passiveness

noun 0.531

passivity

noun 0.529

radiotracking

noun 0.526

radio telescope

noun 0.512

remote sensing

noun 0.510