Extender words are words in which all lower-case letters are extenders — each letter extends either above (the ascender) or below (the descender) the body of the letter. In the English alphabet the following letters are extenders: b, d, f, g, h, i, j, k, l, p, q, t, and y. For example, the words “high” or “hilly” are extender words, also known as tall words, made entirely out of extenders. Browsing through the Oxford English Dictionary, defining more than 291,500 words, here are the shortest and longest extender words:
Shortest extender words (2 letters): by, hi, id, if, it
(3 letters): bib, bid, bit, did, dig, dip, fib, fig, fit, fly, gig, git, gyp, hid, hip, hit, ilk, ill, jib, jig, kid, kip, kit, lid, lip, lit, pig, pip, pit, ply, thy, tip, tit
Longest extender words (9 letters): flightily, lilipilly
(10 letters): lillipilly
Longest word made up of descenders only (3 letters): gyp
Longest word made up of ascenders only (6 letters): tidbit
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For further reading: The Joy of Lex by Gyles Brandreth (2001)