For children who can spell well, is James Thurber's 1957 story The Wonderful O, about a tyrannical pirate who bans everything on an island that contains the letter O - because his mother was once stuck in a porthole, with tragic consequences.
Full of word lists and wordplay, with charming illustrations by Marc Simont, it is a verbally ambitious little classic for logophiles. Or, as the pirate would have it, lgphiles.