We have lots of words, but Dieffenthalois is not one of them. Did you just make it up?
The word Dieffenthalois does not have anagrams.
The word Dieffenthalois spelled backward is siolahtneffeid which is not a word.
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Please note: the Wiktionary contains many more words - in particular proper nouns and inflected forms: plurals of nouns and past tense of verbs - than other English language dictionaries such as the Official Scrabble Players Dictionary (OSPD) from Merriam-Webster, the Official Tournament and Club Word List (OTCWL / OWL / TWL) from the National Scrabble Association, and the Collins Scrabble Words used in the UK (about 180,000 words each). LotsOfWords knows 480,000 words.