Keskuse (Keskus)
Centre. It being the street planned to be the centre of the then new Mustamäe district. But, given the naming of Viru Keskus, Kristiine Keskus, Järve Keskus and so on, also ‘mall’.
Ketraja (Ketraja)
Spinner, after those working at Balti Manufaktuur (see Manufaktuuri and Kangru). But also, for those fascinated with the truly trivial or relatively irrelevant, a dialectical name for öösorr, the European nightjar, Caprimulgus europaeus.
Ketta (Ketas)
Disc, discus, puck. Kettamaailm is Discworld, and kõvaketas is hard disk.