Is “Commonest” a Scrabble word?
Yes
COMMONEST
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 Commonest
adjective
1.Mutual; shared by more than one.
“The two competitors have the common aim of winning the championship.”
2.Occurring or happening regularly or frequently; usual.
“It is common to find sharks off this coast.”
3.Found in large numbers or in a large quantity; usual.
“It differs from the common blackbird in the size of its beak.”
Synonyms: appellative, epicene, mutual, shared, widespread, common-or-garden