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A word that begins and ends with E and has only 1 letter in between is EYE. Begins and ends with E and the Y is in between.
E
Envelope
strengths
If the question means 'one other letter', I believe the answer is eye. (Adds one letter Y.) If the question is a riddle, the answer is 'envelope' as it begins and ends with 'e', and it contains a letter.
Envelope begins and ends with the letter e. It contains one letter.
One four letter word that starts with r is riot.
One-half is a hyphenated word. It begins with the letter O.
one is advocateannounce
An envelope
Ergosterol, for one.
Coal is an energy word. It begins with the letter C.