Replacement.
A synonym for "synonym" is "equivalent." Both terms refer to words or phrases that have similar meanings or can be used interchangeably in certain contexts. Other alternatives include "substitute" or "alternative."
A synonym for varied is diverse.
A synonym for temper is temperament.
I don't think there is a synonym for adjoined it is an antonym.
Secure is a synonym for safe.
substitute
An appropriate synonym for "supplanted" would be "substitute".
A synonym for the keyword "substitute" is "alternative."
backup, temporary, another, alternative, substitute
Examples of synonyms for the word 'pronoun' are word or substitute.
option, vote, pick, choosing, alternative, substitute,
In this sentence, the best synonym for "perspicacious" would be "perceptive" as it conveys the idea of keen insight and understanding.
It’s a synonym. The two words mean the same thin.
Another synonym is intermittent. You could also use the words random irregular occasional
"Substitute" and "switch" are synonyms as they both refer to replacing something with another. However, they are not homophones which are words that sound the same but have different meanings. An antonym of "substitute" could be "original" or "primary" as they denote opposing ideas.
artificial, bogus, copied, counterfeit, fake, false, imitation, manufactured, phony, pretended, sham, simulated, spurious, substitute, synthetic.
A synonym for sick (such as ill) could be substituted.