nidus indus ndius dnius idnus dinus niuds inuds nuids unids iunds uinds nduis dnuis nudis undis dunis udnis iduns diuns iudns uidns duins udins nidsu indsu ndisu dnisu idnsu dinsu nisdu insdu nsidu snidu isndu sindu ndsiu dnsiu nsdiu sndiu dsniu sdniu idsnu disnu isdnu sidnu dsinu sdinu niusd inusd nuisd unisd iunsd uinsd nisud insud nsiud sniud isnud sinud nusid unsid nsuid snuid usnid sunid iusnd uisnd isund siund usind suind ndusi dnusi nudsi undsi dunsi udnsi ndsui dnsui nsdui sndui dsnui sdnui nusdi unsdi nsudi snudi usndi sundi dusni udsni dsuni sduni usdni sudni idusn diusn iudsn uidsn duisn udisn idsun disun isdun sidun dsiun sdiun iusdn uisdn isudn siudn usidn suidn dusin udsin dsuin sduin usdin sudin
Note: these 'words' (valid or invalid) are all the permutations of the word nidus. These words are obtained by scrambling the letters in nidus.