jeremy wrote:Keyboard = entertainment-oriented instrument
Synthesizer = musical production-oriented instrument
Surely Keyboard is just the keys / input or peformance part of the instrument. A piano has a 'keyboard', a synth has a 'keyboard' as does a harpsichord.
key‧board  [kee-bawrd, -bohrd] Pronunciation Key - Show IPA Pronunciation
–noun
1. the row or set of keys on a piano, organ, or the like.
2. a set of keys, usually arranged in tiers, for operating a typewriter, typesetting machine, computer terminal, or the like.
3. any of various musical instruments played by means of a pianolike keyboard, as a piano, electric piano, or organ.
–verb (used with object), verb (used without object)
4. Also, key, key in. Computers. to enter (information) into a computer by means of a keyboard.
5. to set (text) in type, using a machine that is operated by a keyboard.