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rover

rov·er

rover

 
pronunciation:
ro vr
part of speech: noun
definition 1: one who roves; wanderer.
synonyms:
nomad, roamer, wanderer
similar words:
drifter, tramp, vagabond
definition 2: a type of vehicle designed to travel on the surface of a planet, comet, or moon, for the purpose of providing transportation or retrieving scientific data.