equivalent word vs synonym

equivalent word and synonym both are nouns.

Word	Noun	Adjective	Verb	Adverb
equivalent word	Yes	No	No	No
synonym	Yes	No	No	No

As nouns, equivalent word and synonym are synonyms defined as:

equivalent word and synonym: two words that can be interchanged in a context are said to be synonymous relative to that context

equivalent word (noun)	synonym (noun)
two words that can be interchanged in a context are said to be synonymous relative to that context	two words that can be interchanged in a context are said to be synonymous relative to that context