Envelope.
Panorama is one such word.
An 8 letter word, with just one letter in it, is ENVELOPE. 8 letters in the word, 1 letter inside the envelope.
Sharp
herd- change the n to an h
There is no one-word 8-letter palindrome in English, apparently!
Double-u
envelopeAn envelope usually contains only one letter.
There's only one : BEPESTER
Envelope is the answer.
envelope
Eight is Light
Panorama is one such word.
one word LUDEN"S
One choice is the word peculiar.
FIREWORK
Cupid= romantic? marksman?
You are an Envelope