Is “Straightest” a Scrabble word?
Yes
STRAIGHTEST
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 Straightest
adjective
1.Not crooked or bent; having a constant direction throughout its length.
2.(of a path, trajectory, etc.) Direct, undeviating.
3.Perfectly horizontal or vertical; not diagonal or oblique.
Synonyms: straightedge