Siker is a 5 letter English word. It's valid Scrabble word worth 9 points. It's valid Words with friends word worth 9 points.
You can make 63 anagrams from letters in siker (eikrs).
before 900; Middle English siker, Old English sicor; cognate with Dutch zeker, German sicher, all ≪ Latin sēcūrus; see secure
And therefore, I am siker that this may not be, without a great token.