Try one of these:
Outdated, antequated, antideluvian, bygone, dated.
Antique has a synonym of obsolete. Obsolete has a synonym of outmoded. Since outmode is a transient verb it is always conjugated. But outmode is a word, it is 7 letters and it is a synonym for antique.
Obsolete
expired or old
Old-fashioned, passé, obsolete, obsolescent.
'Hamlet' is one obsolete word for village.
Obsolete is an adjective.
Card readers are obsolete.
synonymize
obsolete
"Word for word" is a synonym for verbatim.
The antonym of the word 'synonym' is 'antonym'.
"Alternate word" is a noun-phrase that is kind of a synonym for the word "synonym. There is no one exact word that means the same as synonym.