In lang=en terms the difference between crescent and sickle
is that
crescent is to adorn with crescents while
sickle is to assume an abnormal crescent shape used of red blood cells.
As nouns the difference between crescent and sickle
is that
crescent is the figure of the moon as it appears in its first or last quarter, with concave and convex edges terminating in points while
sickle is (agriculture) an implement, having a semicircular blade and short handle, used for cutting long grass and cereal crops.
As adjectives the difference between crescent and sickle
is that
crescent is (dated|rare) marked by an increase; waxing, like the moon while
sickle is shaped like the blade of a sickle; crescent-shaped.
As verbs the difference between crescent and sickle
is that
crescent is to form into a crescent, or something resembling a crescent while
sickle is (agriculture|transitive) to cut with a sickle.