renal ernal rneal nreal enral neral reanl eranl raenl arenl earnl aernl rnael nrael ranel arnel narel anrel enarl nearl eanrl aenrl naerl anerl renla ernla rnela nrela enrla nerla relna erlna rlena lrena elrna lerna rnlea nrlea rlnea lrnea nlrea lnrea enlra nelra elnra lenra nlera lnera realn eraln raeln areln earln aerln relan erlan rlean lrean elran leran ralen arlen rlaen lraen alren laren ealrn aelrn elarn learn alern laern rnale nrale ranle arnle narle anrle rnlae nrlae rlnae lrnae nlrae lnrae ralne arlne rlane lrane alrne larne nalre anlre nlare lnare alnre lanre enalr nealr eanlr aenlr naelr anelr enlar nelar elnar lenar nlear lnear ealnr aelnr elanr leanr alenr laenr naler anler nlaer lnaer alner laner
Note: these 'words' (valid or invalid) are all the permutations of the word renal. These words are obtained by scrambling the letters in renal.