ihard hiard iahrd aihrd haird ahird ihrad hirad irhad rihad hriad rhiad iarhd airhd irahd riahd arihd raihd harid ahrid hraid rhaid arhid rahid ihadr hiadr iahdr aihdr haidr ahidr ihdar hidar idhar dihar hdiar dhiar iadhr aidhr idahr diahr adihr daihr hadir ahdir hdair dhair adhir dahir ihrda hirda irhda rihda hrida rhida ihdra hidra idhra dihra hdira dhira irdha ridha idrha dirha rdiha driha hrdia rhdia hdria dhria rdhia drhia iardh airdh iradh riadh aridh raidh iadrh aidrh idarh diarh adirh dairh irdah ridah idrah dirah rdiah driah ardih radih adrih darih rdaih draih hardi ahrdi hradi rhadi arhdi rahdi hadri ahdri hdari dhari adhri dahri hrdai rhdai hdrai dhrai rdhai drhai ardhi radhi adrhi darhi rdahi drahi
Note: these 'words' (valid or invalid) are all the permutations of the word ihard. These words are obtained by scrambling the letters in ihard.