Is “Decoder” a Scrabble word?
Yes
DECODER
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 Decoder
/dɪˈkəʊdə(ɹ)/
noun
1.A person who decodes secret messages
2.A device that decodes a scrambled electronic signal e.g. of a satellite television signal