descender vs abseiler

descender and abseiler both are nouns.

Word	Noun	Adjective	Verb	Adverb
descender	Yes	No	No	No
abseiler	Yes	No	No	No

As nouns, abseiler is a hyponym of descender; that is, abseiler is a word with a more specific, narrower meaning than descender:

descender: someone who descends
abseiler: a person who descends down a nearly vertical face by using a doubled rope that is wrapped around the body and attached to some high point

Other hyponyms of descender include rappeller.

descender (noun)	abseiler (noun)
(printing) the part of lowercase letters that extends below the other lowercase letters	a person who descends down a nearly vertical face by using a doubled rope that is wrapped around the body and attached to some high point
a lowercase letter that has a part extending below other lowercase letters
someone who descends