There are a number of different 'official' Scrabble dictionaries, but at least for this question I'm primarily interested in North American play, and so I'm interested in two word lists particularly: OWL2, the official tournament word list; and OSPD4, the 'Official Scrabble Player's Dictionary', which is used for school play and is the dictionary you can find in your favorite bookstore. The difference between the two is that OWL2 includes a number of offensive words that aren't in the OSPD (you can find a good list of the differences here).
My question is, what's the effect of the larger word list in practice? Scanning through the list I can only see two words that seem likely to get any substantial amount of play:
LEZ (just as a short Z word - although note that LE isn't a legal two-letter word, so this doesn't provide a hook) and
YID (which is a hook onto ID for playing a Y). I'm curious whether this has been formally studied at all, and if anyone has any pointers as to how often these words actually come up in practice in tournaments.