The OWL2 and the OSPD5 are compiled using four (originally five) major college-level dictionaries, including Merriam-Webster (10th and 11th editions, respectively). If a word appears, at least historically, in any one of the dictionaries, it will be included in the OWL2 and the OSPD5. If the word has only an offensive meaning, it is only included in the OWL2. The key difference between the OSPD5 and the OWL2 is that the OSPD5 is marketed for "home and school" use, with expurgated words which their source dictionaries judged offensive, rendering the "Official Scrabble Players Dictionary" less fit for official "Scrabble" play. The OSPD5, released in 2014, is available in bookstores, whereas the OWL2 is only available through NASPA).