Because it isn't in the list of accepted words[0] (most used words) as inspired by XKCD[1]. [0] https://splasho.com/upgoer5/phpspellcheck/dictionaries/1000.dic

Because it isn't in the list of accepted words[0] (most used words) as inspired by XKCD[1]. [0] https://splasho.com/upgoer5/phpspellcheck/dictionaries/1000.dicin https://splasho.com/upgoer5/phpspellcheck/dictionaries/1000.... [1] https://xkcd.com/1133/ https://xkcd.com/1133/ Edit: I just figured out you might fully realize that and were probably just pointing it out to OP. Ignore me. :)