liquor

Liquor comes from Middle English licour, borrowed via Anglo-Norman licour from Latin liquor, meaning fluidity or a fluid, itself from the verb liquere, 'to be fluid or liquid.'

The Latin root was a broad term for any liquid substance, and English first used it the same way before it narrowed toward the sense of a distilled or alcoholic drink.

It's a doublet of liqueur, meaning both words trace back to the same Latin liquor, having entered English through different paths.