Someone who tunes pianos.

synonym: piano tuner.

Dutch: intoneur, pianostemmer, stemmer

An electronic receiver that detects and demodulates and amplifies transmitted signals.

synonyms: radio, radio receiver, radio set, receiving set, wireless.

Dutch: afstemeenheid, afstemmer, radio, radiotoestel, receiver, tuner, tuner-versterker
Polish: radio, aparat radiowy, odbiornik radiowy, radioodbiornik, radioaparat