nor
6 letter words starting and ending with N:napkinnationneuronnotion
Put any vowel between, and you get a word: nae, nee, nie, noe, nue, nye.
lesion legion lichen lesson loosen listen lipton london
Overnight sojourn
Nesbia
nonagon
Niagara
Pan, Pain, Pin
nervous
Narc.
nor
join
vision
marathon melanin
One word that starts with "s" and ends with "n" is "salmon."
natio