I have just purchased, through Reader's Digest, a copy of
Collins Million Word Crossword Dictionary
It states on the cover - All the words you need for completing crosswords.
I also have a copy of Chambers Crossword Dictionary, again through Reader's Digest.
About 50 years ago, I bought, from a work colleague, a two volume Funk & Wagnell Dictionary, one set of many slightly fire damaged copies, he was selling on behalf of an uncle. The price? 10/- (50p)!!!! They have served me well!!