Is “Atheism” a Scrabble word?
Yes
ATHEISM
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 Atheism
/ˈeɪθiɪzəm/
noun
1.(narrowly) Belief that no deities exist (sometimes including rejection of other religious beliefs).
2.(broadly) Rejection of belief that any deities exist (with or without a belief that no deities exist).
3.(very broadly) Absence of belief that any deities exist (including absence of the concept of deities).