ghast hgast gahst aghst hagst ahgst ghsat hgsat gshat sghat hsgat shgat gasht agsht gsaht sgaht asght saght hasgt ahsgt hsagt shagt ashgt sahgt ghats hgats gahts aghts hagts ahgts ghtas hgtas gthas tghas htgas thgas gaths agths gtahs tgahs atghs taghs hatgs ahtgs htags thags athgs tahgs ghsta hgsta gshta sghta hsgta shgta ghtsa hgtsa gthsa tghsa htgsa thgsa gstha sgtha gtsha tgsha stgha tsgha hstga shtga htsga thsga sthga tshga gasth agsth gsath sgath asgth sagth gatsh agtsh gtash tgash atgsh tagsh gstah sgtah gtsah tgsah stgah tsgah astgh satgh atsgh tasgh stagh tsagh hastg ahstg hsatg shatg ashtg sahtg hatsg ahtsg htasg thasg athsg tahsg hstag shtag htsag thsag sthag tshag asthg sathg atshg tashg stahg tsahg
Note: these 'words' (valid or invalid) are all the permutations of the word ghast. These words are obtained by scrambling the letters in ghast.