There is no common one-word anagram.
The term "expint" is a mathematical computational function (exponent integral).
The longest word is "next."
(*with a U instead of the i, they would spell the term 'next up')
The letters in "these letters" can spell the phrase "ether settles." The letters can spell shorter words such as trestles, sheerest, shelters, and treeless.
The letters can spell the anagram "annotation."
You can spell burials with those letters.
The letters CEIECTLR can spell the word ELECTRIC.
Those letters spell after.
Those letters spell natural.
The letters in "these letters" can spell the phrase "ether settles." The letters can spell shorter words such as trestles, sheerest, shelters, and treeless.
Those letters will spell dollar.
The letters spell 'broccoli'.
Those letters spell psycho.
Those letters will spell carnivore.
The letters can spell the anagram "annotation."
Those letters will spell democratic.
Those letters will spell turnip.
Those letters will spell artichoke.
Those letters will spell hairy.
The letters spell the word temples.