同义

[ 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
<noun.linkdef>

Homonymy \Ho*mon"y*my\, n. [Gr. ?: cf. F. 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.