有冇d網站或書籍專講英文同義詞?

書籍專講英文同義詞, buy a Thesaurus from any bookstore, buy the Oxford one. Or you can use the function Thesaurus in MS Word.

在會考考試上運用較深的同義詞, 是好是壞?? Simple English is good English. Don't try to push yourself too hard and use difficult vocabularies.

vocabulary ~ all words, so usually has no plural form