Unsistered is valid Scrabble Word

Is unsistered a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is unsistered valid Words with Friends?
Words with Friends NO

10 letters word
11 points in Scrabble
13 points in WWF

Definitions for UNSISTERED in dictionary:

ADJECTIVE:

without a sister

Similar words containing SISTER without suffix ed and without prefix un

sister6 sisters7 assister8 insister8 resister8 sistered9 sisterly11 assisters9 insisters9 persister11 resisters9 sistering10 subsister11 koeksister18 persisters12 sisterhood14 sisterless10 sisterlike14 stepsister12 subsisters12 unsisterly13 sisterlier10 koeksisters19 sisterhoods15 stepsisters13 sisterliest11 sisterliness12 sisterlinesses14 unsisterliness14

Find what other words can be done using letters: "unsistered"
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