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 160,000 root words and 222,000 senses many proper nouns, pronunciations, and usage tags. You can also quickly view Web references such as the Wikipedia encyclopedia.

Free Features:

• One-click lookup in almost any Windows program.
• Hundreds of thousands of definitions and synonyms.
• The latest international English words.
• Works offline, or reference to Wikipedia and web references.
• Instantly look up definitions of words, right from your desktop.
• Expand your vocabulary by exploring synonyms and antonyms for any word you encounter.
• Discover connections between words and broaden your linguistic horizons effortlessly.
• Seamlessly search for word meanings within various applications without interrupting your workflow.
• Access up to 5000 word pronunciations to enhance your spoken English skills.

• Pro Features:

• One-click look up from almost any program, including MS Word.
• Tab pages to quickly check web references.
• Add optional third-party dictionaries in separate tabs.
• 70,000 audio pronunciations.
• Clear text pronunciations with syllables.
• Bookmark words.
• Highlights commonly used widely-understood words.
• Links between sounds-like and often-confused words.
• Find words matching a pattern.
• Add definitions to the database.
• Solve and find anagrams.
• Copy results to the clipboard.
•  Search for words in a large number of optional extra word lists.
• Add your own custom glossaries.
• Import and export custom definitions and glossaries.
• Configure for American, British, Canadian, Australian or Asian English.
• Option to hide (default) or flag vulgar and offensive related words.
• Reverse definition (full text) search.
• The extensive up-to-date dictionary database features:.
• Definitions and synonyms, including many compounds and proper nouns.
• Word relations: find antonyms, parts or types, less specific words, etc.
• Over 130 000 synonym sets and 165 000 root words.
• Search 290 000 words, compounds and derived forms.
• 70,000 pronunciations, with pop-up hint pronunciation key.
• 70,000 usage examples.
• View alphabetically nearest words, suggestions for many misspellings.