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Oxford dictionary definition of the word synonym:
a word that means the same or nearly the same as another word, such as bucket and pail
a word or phrase used as another name for something, such as Hellene for a Greek
(biology) a taxonomic name that has been superseded or rejected
ˌsynoˈnymic, ˌsynoˈnymical adjective
C16: via Late Latin from Greek sunōnumon, from syn- + onoma name