Nouns

(n)flexure, flection, flexionthe state of being flexed (as of a joint)
(n)fold, crease, plication, flexure, crimp, bendan angular or rounded shape made by folding“a fold in the napkin”, “a crease in his trousers”, “a plication on her blouse”, “a flexure of the colon”, “a bend of his elbow”
(n)flexion, flexureact of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased