What's the synonym of the word "megapolis"?

“大都市”这个词同词是什么？

Synonyms are words that have the same or approximately the same meaning.

同词指具有相同或近似词。

At the entry for “kill”, my thesaurus lists“murder”, “assassinate”and “waste”.

我同词词典在kill条目murder, assassinate, waste词条。