@dan is basically correct. Only one major dictionary, the Merriam-Webster Online, mentions paydirt as one word, and it is given as an alternate version to the entry pay dirt.

Also, paydirt as a single word is not in the US or the UK Official Scrabble Player's Dictionary (not that they have any bearing on Lexulous...).

Sorry; that seems to be one good Bingo lost.

@roymccoy: What dictionary are you using? DOX, DOXED, DOXES, and DOXING are all acceptable in the UK dictionary (as is DOXY, but that is a noun with a completely different meaning).

@clancy1 Hi Jenny - I don't make removal decisions; I just play Lexulous. Like others, I have, at times, found the word 'cunt' convenient, if embarrassing, to play.
It is defined as a word in dictionaries across the internet, has existed as a word since the 14th century, and certainly sets no precedent for acceptable vulgarity with Lexulous.
Just because you wouldn't say a word doesn't mean you can't play a word.

@gretchen-hunter When referring to the toy (and probably when referring to a dolt), "yo-yo" is hyphenated. It is, therefore, unacceptable.

@carolyn-leverich-atkinson : "Favala" with an a is not considered valid anywhere; not even in Brazilian Portuguese.
However, "favela" with an e means shanty town in Brazil and has been adopted into English (at least the online Collins Dictionary lists it).