aster sater atser taser staer tsaer asetr saetr aestr eastr seatr esatr atesr taesr aetsr eatsr teasr etasr stear tsear setar estar tesar etsar astre satre atsre tasre stare tsare asrte sarte arste raste srate rsate atrse tarse artse ratse trase rtase strae tsrae srtae rstae trsae rtsae asert saert aesrt easrt seart esart asret saret arset raset sraet rsaet aerst earst arest raest erast reast serat esrat sreat rseat ersat resat aters taers aetrs eatrs tears etars atres tares artes rates traes rtaes aerts earts arets raets erats reats teras etras treas rteas ertas retas stera tsera setra estra tesra etsra strea tsrea srtea rstea trsea rtsea serta esrta sreta rseta ersta resta tersa etrsa tresa rtesa ertsa retsa
Note: these 'words' (valid or invalid) are all the permutations of the word aster. These words are obtained by scrambling the letters in aster.