Endpoint vs Hygroscopic - What's the difference?

As a noun endpoint

is either of the two points at the end of a line segment.

(physics|chemistry) readily taking up and retaining water, especially from the atmosphere.

(wikipedia endpoint)

(en noun)

Either of the two points at the end of a line segment

(biology, medicine) A defined occurrence during the observation period of an experiment or study.

(chemistry) The stage in a titration at which a change in the colour of an indicator indicates that no more titrant should be added

(computing, telecommunications) The entity at one end of a connection.

(mathematics) Either of the two nodes of a graph of degree 1

* humane endpoint

(en adjective)

(physics, chemistry) Readily taking up and retaining water, especially from the atmosphere.

* anhygroscopic