Probably not. Maybe there is an obscure word made up of these letters, but it is not likely. It very much appears to be a random sequence and not worth the time.
MNKLJYRSAEOERC
Those letters spell escape.
The letters 'jelgan' unscramble to spell the word jangle.The next possible longest words are angel, angle and glean.
The letters 'lmrauof' unscramble to spell the word forumla.The next possible longest words are armful and formal.
Insatiable already is a word. Basically means someone can't get enough.But the anagram is the plural noun banalities.
butterbeer
werewolf
Gillyweed
Madam Hooch.
Peppermint toads
Vernon Dursley
Elixir of life