Flavor is a combination of taste, smell and touch

"Flavor is a complex mixture of sensory input composed of taste (gustation), smell (olfaction) and the tactile sensation of food as it is being munched, a characteristic that food scientists often term "mouth-feel."  Scientific American.

Taste in a technical sense is not synonymous with flavor but instead means the sensations arising from the taste cells in the mouth.  An accompanying story describes more about taste, with illustrations.

Four basic tastes

There are four basic tastes:  sweet, sour, salty and bitter.  Some scientists recently proposed that a fifth taste exists, called umami, and refers to a "meaty" or "savory" sensation.

Taste map is wrong

Scientists have discovered that the traditional map of the tongue is wrong.  The traditional map shows the sweet receptors at the front, the salt receptors along the side, etc.  Now, however, scientists have shown that all taste cells detect all four (or five) basic tastes.