faurd afurd fuard ufard aufrd uafrd farud afrud fraud rfaud arfud rafud furad ufrad fruad rfuad urfad rufad aurfd uarfd arufd raufd urafd ruafd faudr afudr fuadr ufadr aufdr uafdr fadur afdur fdaur dfaur adfur dafur fudar ufdar fduar dfuar udfar dufar audfr uadfr adufr daufr udafr duafr fardu afrdu fradu rfadu arfdu rafdu fadru afdru fdaru dfaru adfru dafru frdau rfdau fdrau dfrau rdfau drfau ardfu radfu adrfu darfu rdafu drafu furda ufrda fruda rfuda urfda rufda fudra ufdra fdura dfura udfra dufra frdua rfdua fdrua dfrua rdfua drfua urdfa rudfa udrfa durfa rdufa drufa aurdf uardf arudf raudf uradf ruadf audrf uadrf adurf daurf udarf duarf arduf raduf adruf daruf rdauf drauf urdaf rudaf udraf duraf rduaf druaf
Note: these 'words' (valid or invalid) are all the permutations of the word faurd. These words are obtained by scrambling the letters in faurd.