Is “Sir” a Scrabble word?
Yes
SIR
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 Sir
/ˈsə(ɹ)/
noun
1.A man of a higher rank or position.
2.A respectful term of address to a man of higher rank or position, particularly:
3.A respectful term of address to an adult male (often older), especially if his name or proper title is unknown.
“Excuse me, sir, do you know the way to the art museum?”
verb
1.To address (someone) using "sir".
“Sir, yes, sir! Don't you sir me, private! I work for a living!”