The most common noun form of
desert (“arid land with usually sparse vegetation”) is pronounced the same way as the adjectival form of this word (“desolate and sparsely occupied or unoccupied”), but not the same way as the verb (“to withdraw from or leave usually without intent to return”), even though all three words come from the same source (the Latin
deserere, “to desert”). The verb
desert is pronounced the same way as the
dessert you eat after dinner (which comes from the Latin
servir, “to serve”). And, to make things even more interesting (by which we mean confusing), there is another noun form of
desert, spelled the same as the “arid land” word, but pronounced like the thing one eats after dinner, and with a meaning that is similar to neither.
Just deserts uses this, relatively uncommon, noun form of
desert, which may mean “deserved reward or punishment” (usually used in plural), “the quality or fact of meriting reward or punishment,” or “excellence, worth.”