Definition of freethinker. : a person who thinks freely or independently : one who forms opinions on the basis of reason independently of authority; especially : one who rejects or is skeptical of religious dogma.
Even though most German speakers may understand what you mean when you say beamer instead of projector, native English speakers will typically be completely lost. * Evidence for the use of the word beamer for BMW cars and motorbikes can be found in the Oxford English Dictionary, see here. An alternative spelling is beemer. Moreover, as explained here, BMW enthusiasts use beamer/beemer for cars and beamer for motorbikes. (Thanks to Eric for the link.)
Old English beam originally living tree, but by late 10c. also rafter, post, ship's timber, from Proto-Germanic *baumaz (cf. Old Norse baÃ°mr, Old Frisian bam tree, gallows, beam, Middle Dutch boom, Old High German boum, German Baum tree, Gothic bagms), perhaps from PIE verb root *bheue- to grow (see be). The shift from *-au- to -ea- is regular in Old English.