Salty
Salty is used to describe food that tastes too much of salt. It is usually used as a negative description.
This popcorn is very salty; it makes my lips burn.
Bitter
Bitter describes a strong and sometimes unpleasant flavor that is the opposite of sweet.
Coffee, very dark chocolate, beer and citrus peel are all bitter.
Tart
Tart describes a sharp and acidic taste. Sour can also be used, but it often has a negative meaning.
Lemon, white wine, Greek yogurt, pickles and some raspberries are all tart foods.
Smoky
Smoky describes foods that taste of smoked wood.
Bacon, whisky, and lox/smoked salmon are all smoky foods.