- x-benen, knock-knees, X-Beine, jambes en x, piernas torcidas
- X-chromosome, X chromosome, X-Chromosom, chromosome X, cromosoma X
- X-eenheid, X unit, X-Einheit, unité, X unidad
- x-stralen, x-rays, Röntgenstrahlen, rayons X, rayos equis
- XTC, XTC, XTC, ecstasy, XTC
- XTC-handel, XTC trade, XTC Handel, ecstasy commerce, comercio de XTC
- XTC-laboratorium, XTC lab, XTC Laboratorium, ecstasy laboratoire, laboratorio de XTC
- xylitol, xylitol, Xylitol, xylitol, xilitol
- xylofoon, xylophone, Xylophon, xylophone, xilofón
- xylograaf, xylographer, Xylograph, xylographe, xilógrafo
- xylophonist, xylophonist, Xylophonspieler, xylophoniste, xilofonista