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There is no direct thirteen-letter anagram of the letters naigornutnema. The longest words you can make out of those letters are the eleven-letter long words nonargument and ornamenting.
kindhearted
knithreaded
If you can repeat letters, you can make the word 'eleven'.
anesthesia or anesthetic; one needs the Amer. spelling to make ten letters. Anaesthesia is eleven.
Those letters make up partnership.
Eleven ... ELEVEN - EL = EVEN
To make merry is a celebration.
They don't make anything. "ELVN" however is an abbreviation for "eleven".
Since the challenge is on level 11, you can spell the word "eleven" by using the E button three times.
You can make several seven letter words with these letters. They include:AcetoneCheapenCheetahHatchet
You can make several seven letter words with the letters 'pladiamhceuc'. They include:AcclaimCalciumChaliceClaimedClampedHelipadMedical