W: (n) scan [Related to: scan] (the act of scanning; systematic examination of a prescribed region) "he made a thorough scan of the beach with his binoculars"
W: (n) scanner [Related to: scan] (a radar dish that rotates or oscillates in order to scan a broad area)
W: (n) scanner [Related to: scan] (a radio receiver that moves automatically across some selected range of frequencies looking for some signal or condition) "they used scanners to monitor police radio channels"