Having the same or a similar meaning: synonymous words.
Equivalent in connotation: "a widespread impression that . . . Hollywood was synonymous with immorality” ( Doris Kearns Goodwin).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.