Subaffluent is valid Scrabble Word

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

11 letters word
19 points in Scrabble
24 points in WWF

Definitions for SUBAFFLUENT in dictionary:

ADJECTIVE:

less than affluent

How to use SUBAFFLUENT in a sentence

Near by ran the Louhi, a river whose course, still undetermined, is an affluent, or at least a sub-affluent, of the Coango, a tributary of the Zoire.

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