heavy ehavy haevy ahevy eahvy aehvy hevay ehvay hveay vheay evhay vehay havey ahvey hvaey vhaey avhey vahey eavhy aevhy evahy veahy avehy vaehy heayv ehayv haeyv aheyv eahyv aehyv heyav ehyav hyeav yheav eyhav yehav hayev ahyev hyaev yhaev ayhev yahev eayhv aeyhv eyahv yeahv ayehv yaehv hevya ehvya hveya vheya evhya vehya heyva ehyva hyeva yheva eyhva yehva hvyea vhyea hyvea yhvea vyhea yvhea evyha veyha eyvha yevha vyeha yveha havye ahvye hvaye vhaye avhye vahye hayve ahyve hyave yhave ayhve yahve hvyae vhyae hyvae yhvae vyhae yvhae avyhe vayhe ayvhe yavhe vyahe yvahe eavyh aevyh evayh veayh aveyh vaeyh eayvh aeyvh eyavh yeavh ayevh yaevh evyah veyah eyvah yevah vyeah yveah avyeh vayeh ayveh yaveh vyaeh yvaeh
Note: these 'words' (valid or invalid) are all the permutations of the word heavy. These words are obtained by scrambling the letters in heavy.