homonym

詳細解釋：

hom.o.nym

n.（名詞）
One of two or more words that have the same sound and often the same spelling but differ in meaning.
同音異義字：兩個或以上單詞發音及經常拼法相同但詞義不同

A word that is used to designate several different things.
用於指示不同事物的詞
A namesake.
同名者，同名物
Biology A taxonomic name that is identical to one previously applied to a different species or genus and that therefore is unacceptable in its new use.
【生物學】 異物同名：一個分類學名詞由於曾被用於以前不同的種屬所以這一新用法不被接受

來源：
Latin homônymum
拉丁語 homônymum
from Greek homônumon [from neuter of] homônumos [homonymous] * see homonymous
源自 希臘語 homônumon [] 源自homônumos的中性詞 [同名的] *參見 homonymous

【引伸】
hom.onym.ic
adj.（形容詞）