sield iseld seild esild iesld eisld siled isled slied lsied ilsed lised selid eslid sleid lseid elsid lesid ielsd eilsd ilesd liesd elisd leisd siedl isedl seidl esidl iesdl eisdl sidel isdel sdiel dsiel idsel disel sedil esdil sdeil dseil edsil desil iedsl eidsl idesl diesl edisl deisl silde islde slide lside ilsde lisde sidle isdle sdile dsile idsle disle sldie lsdie sdlie dslie ldsie dlsie ildse lidse idlse dilse ldise dlise seldi esldi sledi lsedi elsdi lesdi sedli esdli sdeli dseli edsli desli sldei lsdei sdlei dslei ldsei dlsei eldsi ledsi edlsi delsi ldesi dlesi ields eilds ileds lieds elids leids iedls eidls idels diels edils deils ildes lides idles diles ldies dlies eldis ledis edlis delis ldeis dleis
Note: these 'words' (valid or invalid) are all the permutations of the word sield. These words are obtained by scrambling the letters in sield.