本站注：WordWeb 5 是一款出色的thesaurus（主要是同义词）词典，它可以找出一个单词的同义词或反义词，对英语写作极其有用。词典数据量庞大，含15万单词以及11.8万同义词集，而且还可以在线搜索更多专业解释（如维基百科等）。该软件个人可以免费使用，本站推荐使用。

This thesaurus/dictionary can be used to look up words from almost any program. In addition to displaying sense definitions and synonyms, WordWeb can find sets of related words. The database has more than 150,000 root words and 118,000 synonym sets, many proper nouns, pronunciations, and usage tags.

WordWeb is a handy utility that gives you the definition, synonyms, and antonyms of any given word without requiring you to go online, though it can connect to the Internet for expanded functionality should you want it.

The interface feels like an expanded version of any major word processing app's dictionary function, giving users an instant familiarity--even if they've never used WordWeb. After you type a term into the Lookup dialog box, the word's definition will appear in the interface's top pane, along with tabs that link to various wiki functions.

The bottom pane offers tabs for such items as synonyms, antonyms, and related words. The app's most notable feature is its hot key support; you simply use a hot key combo when the cursor is pointed over any word, and WordWeb will pop up onscreen with all pertinent information.

There are tools for changing the database to one of several English variations, altering the text size, and disabling WordWeb from recognizing offensive terms. The depth and functionality of WordWeb would be worth paying for, but thankfully you don't have to redefine your budget to get it--it's free.