Unsupposable is valid Scrabble Word

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

12 letters word
18 points in Scrabble
25 points in WWF

Definitions for UNSUPPOSABLE in dictionary:

ADJECTIVE:

not supposable

How to use UNSUPPOSABLE in a sentence

The formation of salt at the bottom of the sea, without the assistance of subterranean fire, is not a thing unsupposable, as at first sight it might appear.
The Carrizoso plateau had been sacred ground, and it was unsupposable that it could ever be desecrated by the trampling hoofs and scissor noses of these woolly abominations.

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