Synonym Software Any Software Suggestion Like Dictionary Which Will Find Synonyms & Antonyms?

Any software suggestion like dictionary which will find synonyms & antonyms? - synonym software

Plz suggest me if there is a program that is a small dictionary, but that will do the opposite, as if she said a word, I give all the synonyms. Like when we say that
Say the stench is not simply the means but there are other words as synonyms, so rancid, fetid, rotten, dirty,
And also antonyms.
Plz tell me whether there is any software and, if possible, or some rapidshare links in this way plz