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