different between transept vs clerestory

English

From French transept, from New Latin transeptum, from Latin trans (“across”) + saeptum (“fence, partition, enclosure”).

transept (plural transepts)

(architecture) The transversal part of a church, which crosses at right angles to the greatest length, and between the nave and choir. In the basilicas, this had often no projection at its two ends. In Gothic churches these project greatly, and should be called the arms of the transept. It is common, however, to speak of the arms themselves as the transepts.

clerestory (plural clerestories)

(architecture) The upper part of a wall containing windows to let in natural light to a building, especially in the nave, transept and choir of a church or cathedral.

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