This thesis has purpose to examine the synonymy among ``chaso, yacha, namul(vegetable)`` and establish the criteria in the class of vegetable synonyms. With this criteria for a basis, some ``Fruit`` word-class and ``Grain`` word-class having semantic relation with vegetable synonyms will be distinguished. In the earlier studies, the classification of vegetable word-class, fruit word-class, and grain word-class has been presented from the botanical point of view or biochemical point of view. ``Woody plant`` or ``herbaceous plant`` is botanically classified term. ``Sweetness`` has been used as a biochemical criterion. But botanical or biochemical criteria are not enough and sufficient in the classifying synonyms. In this study humanities` criteria or cultural criteria(especially korean food culture) are more appropriate to discriminate synonyms. Humanities` criteria or cultural criteria will be applied to ``Vegetable`` word-class(Chapter. 2). This criteria will be good for classifying the ``Fruit`` word-class, ``Grain`` word-class(Chapter. 3). Not only these ``vegetable, fruit, grain`` word-class but also other boundary word-class in synonymy could be clarified with humanities` criteria or cultural criteria.