Is “Tuner” a Scrabble word?
Yes
TUNER
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Tuner
/ˈtjuː.nɚ/
noun
1.A person who tunes a piano or organ.
2.A device, electronic or mechanical, that helps a person tune a musical instrument by showing the deviation of the played pitch from the desired pitch.
3.On a musical instrument, a peg or mechanical device that changes the tension, and hence pitch, of a string.