Likely words are "superfluous" or "extraneous."
The similar word is redundant (duplicating a function).
synonymize
"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.
"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.
A synonym for the word escape would be flee.
Unnecessary, not needed, optional
Actually, there is no one word that rhymes exactly with unnecessary.
The media irresponsibly reported an unconfirmed rumor, causing an unnecessary, widespread panic. The word widespread is an adjective, and the word extensive is a synonym.
One synonym for choice is option.
Synonyms: insignificant, unnecessary, inappropriate, unimportant Antonyms: relevant, appropriate, necessary, significant, important
The unnecessary word in the phrase "Contains an unnecessary wordwhich one what sentences" is "which." The phrase is unclear and could be simplified for better understanding. A clearer version might be, "Identify the unnecessary word in the sentences."
One synonym for the word "cell" could be "compartment."
The one word synonym for "underground passageway" is "tunnel".