Carrot
WordNet
noun
(1) Promise of reward as in "carrot and stick"
"Used the carrot of subsidized housing for the workers to get their vote";
(2) Orange root; important source of carotene
(3) Perennial plant widely cultivated as an annual in many varieties for its long conical orange edible roots; temperate and tropical regions
(4) Deep orange edible root of the cultivated carrot plant