Since there are two posts witch are valid awnsers i will be really clever and do two words that share a comn theme while being valid responses to your words
For eloquent i give the word: tinder
Because it's an eloquent way of saying shit you start fires with
For ethanol i give the word: lighter
Because you could theoretically use ethanol as lighter fuel
They of corse both end in r and follow the theme of fire, so i'm sure it wouldn't be too hard for a respons t lnk them back nto one word :p