Crabbe's English Synonyms and Fernald's Synonyms and antonyms are good books of reference for this purpose.
"Practical Grammar and Composition"
Thomas Wood
Books of synonyms and antonyms-used cautiously, for there are few perfect synonyms in any language-will be found of great help.
"The Art of Public Speaking"
Dale Carnagey (AKA Dale Carnegie) and J. Berg Esenwein
Of smaller books of synonyms and antonyms there are plenty.
"The Art of Public Speaking"
Dale Carnagey (AKA Dale Carnegie) and J. Berg Esenwein