Cave
oblige
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."
The letters CEIECTLR can spell the word ELECTRIC.
There is no anagram. The longest words are fain and naif. Others are inn, fan, fin, if, in, an, and a.
Cave
sad, nag, sand, gas, gun, sun, dug, an, as
oblige
Those letters spell natural.
surfing
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 strum.
Those letters will spell exciting.
Those letters will spell stigma.
Those letters spell arrest.
Those letters spell exchange.