Empty object.
endoscope
Envelope begins and ends with the letter e. It contains one letter.
Envelope.
The planet Earth.
Cultivate.
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.
What Oklahoma city begins with E
ALWAYS.... England always begins with "E" and End always begins with an "E".
Englewood is a city in Colorado. It begins with e.
Eggplant is a fruit. It begins with the letter e.
Elf is a movie title that begins with the letter "E"
Emery is a rock. It begins with the letter e.