Letters that make rets
s, e, r, t
are letters that make 'rets'
Words within rets
re, et, Re, ret
are words within 'rets'
Anagrams of rets
erst, rest
are anagrams of 'rets'
Words created by adding a letter to the beginning or end of rets
frets, trets
are words created by adding a letter to 'rets'