The word capitonym is a blend of capital with suffix -onym (from the Greek ‘onoma’ meaning ‘name’). There are of course a good few metalinguistic terms with this suffix, well-known words like synonym/antonym and pseudonym, but also more obscure ones like eponym (a word derived from the name of a person, e.g. hoover), BROKEN! (target document not found): textonym (different words formed from the same combination of key presses on devices using predictive texting), contronym (a word with two opposite meanings, e.g. BROKEN! (target document not found): sick) and my own particular favourite, aptronym (a name which relates to its owner’s profession, e.g. William Wordsworth, Usain Bolt). A capitonym is itself a special case of a homonym (a word that is spelt and sounds the same as another word but has a different meaning, e.g. bank = financial institution, bank = land by a river), or in the case of e.g. Polish/polish, a heteronym (a word that is spelt identically to another but has a different meaning and pronunciation, e.g. tear = pull something apart, and tear = liquid from your eye).