syn·o·nym
ˈsinəˌnim/
noun
plural noun: synonyms
a word or phrase that means exactly or nearly the same as another word or phrase in the same language, for example shut is a synonym of close.
synonyms:	alternate, substitute, alternative, equivalent, euphemism
"'harsh' may be used as synonym for 'oppressive'"
a person or thing so closely associated with a particular quality or idea that the mention of their name calls it to mind.
"the Victorian age is a synonym for sexual puritanism"
BIOLOGY
a taxonomic name that has the same application as another, especially one that has been superseded and is no longer valid.