As nouns the difference between toponymy and troponymy
is that toponymy is lexicological study of place names; a branch of onomastics while troponymy is the semantic relation between troponyms.
toponymy
English
Noun
(-)
lexicological study of place names; a branch of onomastics
Synonyms
* toponomastics
Derived terms
* toponym
* toponymic
* toponymist
Hypernyms
* onomastics
troponymy
Noun
(semantics) The semantic relation between troponyms.