different between scolex vs cysticercus

English

Borrowed from Ancient Greek ?????? (sk?l?x, “worm”).

scolex (plural scolices or scoleces or scolexes)

(zoology) The structure at the front end of a tapeworm which, in the adult, has suckers and hooks by which it attaches itself to a host.
- 1859 Robert Bentley Todd - The Cyclopædia of Anatomy and Physiology
  The head, with the circle of hooklets and the four suckers, is then formed at the anterior part of the embryo, constituting now the scolex of Van Beneden.

From French scolex.

scolex n (plural scolexuri)

From Ancient Greek ?????? (kústis, “bladder”) + ?????? (kérkos, “tail”).

cysticercus (plural cysticerci)

The larval stage of any of several tapeworms, having a fluid-filled cyst enclosing a scolex.

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