different between transept vs slype

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.

From slip.

slype (plural slypes)

(architecture) A covered passageway, especially one connecting the transept of a cathedral or monastery to the chapter house.

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