Hydronym is a see also of geonym.
As nouns the difference between hydronym and geonym
is that hydronym is hydronym (name of a body of water) while geonym is a name of a geographical feature.
hydronym
Noun
(
en noun)
the name of a river, lake, sea or any other body of water
geonym
English
Noun
(
en noun)
A name of a geographical feature.
Synonyms
* placename
See also
* toponym
* hydronym