Incredulity.
nonbeliever
The root word is belief.
Examples of antonyms for the verb 'believe' are:denydisbelievediscarddismissdisputedisregardrefuserejectExample use:I don't believe in capital punishment. OR I rejectcapital punishment.
I look at the kids in disbelief for their terrible behavior.
Disbelief. Disbelief: Adj. Lit., does not believe.
disbelief, doubt, unexpected, uncertain, ambiguous
The man was in total disbelief when he found out he made the show.
She looked in disbelief at the driver who was yelling obscenities.
synonymize
word for word
"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.
The antonym of the word 'synonym' is 'antonym'.