HOMONYMY
homonymy
(noun) the relation between two words that are spelled the same way but differ in meaning or the relation between two words that are pronounced the same way but differ in meaning
Source: WordNet® 3.1
Noun
homonymy (countable and uncountable, plural homonymies)
(semantics) The property of being a homonym.
Synonyms
• homonymity (less commonly used)
Source: Wiktionary
Ho*mon"y*my, n. Etym: [Gr. homonymie.]
1. Sameness of name or designation; identity in relations. Holland.
Homonymy may be as well in place as in persons. Fuller.
2. Sameness of name or designation of things or persons which are
different; ambiguity.
Source: Webster’s Unabridged Dictionary 1913 Edition