Is “Plain” a Scrabble word?
Yes
PLAIN
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 Plain
/pleɪn/
adjective
1.Flat, level.
2.Simple.
3.Obvious.
Synonyms: frank, sincere, consarn, darned, stinking, no-frills
adverb
1.Simply.
“I plain forgot.”
2.Plainly; distinctly.
“Tell me plain: do you love me or no?”