Is “Usurp” a Scrabble word?
Yes
USURP
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 Usurp
/juːˈzɜːp/
verb
1.To seize power from another, usually by illegitimate means.
2.To use and assume the coat of arms of another person.
3.To take the place rightfully belonging to someone or something else.