riffled
There is only one word that can be formed using all 7 letters provided. The word that is formed is "saltbox". There are many other words that can be formed using those letters that are 6 letters or less.
A word formed by using the letters of another word is called an anagram.
Sinkage is the seven letter word formed using the letters aeigkns.
Crunches can be formed using the letters cesurhcn.
Librarian is a 9 letter word that has letters BRAIN in it.
discant
panther
monitor
cantdogcoagentcognatecommandcommendcommentcongaeddecagondogfacefagotedmagnetomegatonmetonymmomentamontagetacnodetangoed
savages
stuck
forehead