Is “Highest” a Scrabble word?
Yes
HIGHEST
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 Highest
/ˈhaɪ.ɪst/
adjective
1.Very elevated; extending or being far above a base; tall; lofty.
“The balloon rose high in the sky. The wall was high. a high mountain”
2.Relatively elevated; rising or raised above the average or normal level from which elevation is measured.
3.Having a specified elevation or height; tall.
“three feet high three Mount Everests high”
adverb
1.In or to an elevated position.
“How high above land did you fly?”
2.In or at a great value.
“Costs have grown higher this year again.”
3.At a pitch of great frequency.
“I certainly can't sing that high.”