Credits and licences
Word list: ENABLE (Enhanced North American Benchmark LExicon), released into the public domain by its compilers. Used as fetched from the dolph/dictionary repository on GitHub, commit c65f04b0b5b27a981f437b940cf62fe71320d5ec, file enable1.txt, version ENABLE (enable1.txt), 172,823 words before this site's edits. This site removed 34 entries whose primary sense is a slur. The count is a build output and is updated whenever the list changes.
Definitions: Webster's Revised Unabridged Dictionary (1913), C. and G. Merriam Co., public domain, in the Project Gutenberg transcription prepared by MICRA, Inc., which makes no proprietary claims on its electronic version.
Commonness ranking: SCOWL (Spell Checker Oriented Word Lists), version 2020.12.07, is used to rank results and to choose which words get pages first. It is never the playable list. Its notice, reproduced as its terms require: "The collective work is Copyright 2000-2018 by Kevin Atkinson. Permission to use, copy, modify, distribute and sell these word lists, the associated scripts, the output created from the scripts, and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appears in all copies and that both that copyright notice and this permission notice appear in supporting documentation. Kevin Atkinson makes no representations about the suitability of this array for any purpose. It is provided 'as is' without express or implied warranty." Components taken: english-words.10, english-words.20, english-words.35.
Everything else on this site (design, code, guides, and the short modern explanations on word pages) is original to Pangramist.