Is “Outgrow” a Scrabble word?
Yes
OUTGROW
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 Outgrow
/ˌaʊtˈɡɹəʊ/
verb
1.To become too big in size or too mature in age or outlook to continue to want, need, use, experience, or accept some object, practice, condition, belief, etc.
“I used to have allergies but I outgrew all of them.”
2.To grow faster or larger than.
“The best adapted plant varieties tend to outgrow those less adapted.”