A recent Dave Richeson tweet generated these two links to great pieces having to do with lexicography and the circularity of words (including mathematical or computational aspects):
https://pointatinfinityblog.wordpress.com/2020/05/13/circles-1-circular-definitions/
http://bit-player.org/wp-content/extras/bph-publications/AmSci-1999-03-Hayes-Wordnet.pdf