The best word for "words that mean the same thing" is synonym. A synonym for big is large, for example.
what is the best synonym for autocrat
The best synonym for emit is release.
Best synonym for bossy is KING.
The best synonym for vacuous is 'intelligent'
Sprout is a good synonym.
Synonym for respite: rest
Planned economy- is the best synonym
A synonym is another way of phrasing something. A synonym for "to the best of your knowledge" would be "as far as you can tell".
Did you mean placid? A synonym for placid is calm.
If you mean "calvary", here's a synonym, hill
If you mean to get back at, then the synonym would be revenge.