Improbation is valid Scrabble Word

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

Definitions for IMPROBATION in dictionary:

Words related to IMPROBATION

improbations18
Find what other words can be done using letters: "improbation"
https://scrabble-word.com/finder/improbation
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