Is “Photism” a Scrabble word?
Yes
PHOTISM
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 Photism
/ˈfəʊtɪzəm/
noun
1.A luminous appearance, image or subjective perception of a hallucinatory nature.
2.The color that a synesthete may report seeing in association with a particular letter or number.