Is “Cryptonym” a Scrabble word?
Yes
CRYPTONYM
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 Cryptonym
noun
1.A secret name, a code name.
“The spy was known only by his cryptonym, 'Shadow'.”