Bitterer is valid Scrabble Word

Is bitterer a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is bitterer valid Words with Friends?
Words with Friends YES

Definitions for BITTERER in dictionary:

Words related to BITTERER

bitter8 bitterest11

How to use BITTERER in a sentence

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