butter

A soft, fatty foodstuff made by churning the cream of milk (generally cow's milk).

Any of various foodstuffs made from other foods or oils, similar in consistency to, eaten like or intended as a substitute for butter (preceded by the name of the food used to make it).

Any of various substances made from other (especially plant-based) oils or fats, used in moisturizers, cosmetics, etc.

(obsolete, chemistry) Any specific soft substance.

(aviation, slang) A smooth plane landing.