hexad ehxad hxead xhead exhad xehad heaxd ehaxd haexd ahexd eahxd aehxd hxaed xhaed haxed ahxed xahed axhed exahd xeahd eaxhd aexhd xaehd axehd hexda ehxda hxeda xheda exhda xehda hedxa ehdxa hdexa dhexa edhxa dehxa hxdea xhdea hdxea dhxea xdhea dxhea exdha xedha edxha dexha xdeha dxeha headx ehadx haedx ahedx eahdx aehdx hedax ehdax hdeax dheax edhax dehax hadex ahdex hdaex dhaex adhex dahex eadhx aedhx edahx deahx adehx daehx hxade xhade haxde ahxde xahde axhde hxdae xhdae hdxae dhxae xdhae dxhae hadxe ahdxe hdaxe dhaxe adhxe dahxe xadhe axdhe xdahe dxahe adxhe daxhe exadh xeadh eaxdh aexdh xaedh axedh exdah xedah edxah dexah xdeah dxeah eadxh aedxh edaxh deaxh adexh daexh xadeh axdeh xdaeh dxaeh adxeh daxeh
Note: these 'words' (valid or invalid) are all the permutations of the word hexad. These words are obtained by scrambling the letters in hexad.