Mobysaurus is a free, feature-rich English thesaurus and dictionary software that integrates Moby Thesaurus II,Roget’s ThesaurusGCIDE Dictionary and WordNet — all royalty-free, powerful and most suitable for everyday reference. With this, you will feel it so much easier to choose the right word or words for every occasion or purpose.

  • Download: here.
  • Link to discussion forum: here.
  • Read notes about fix for Vista X64: here.


Comprehension Moby Thesaurus II                    30,260 headwords , >2,500,000 synonyms

Roget’s Thesaurus                   1,044 Titles, >200,000 synonyms

GCIDE Dictionary                     125,422 headwords

WordNet 2.0                              115,424 headwords

Offline Database You no longer have to search online thesaurus references, waiting the page (and ads) to load and risking spyware or adware attacks. Search anything, anywhere, anytime.
Fully Searchable No need to flip pages any more, and no words remain elusive. Carrying your order, Mobysaurus searches every corner of its database. and displays results in full detail. In most cases you won’t need to conduct multiple searches or racking your nerves to refine queries.No secret areas reserved only for “members”, what you have is exactly what the author has.
Powerful Search Mobysaurus itself is capable of handling 3 powerful search modes as listed below:(All support wildcards)

Search Modes

1. Look up in Root Words

If you look up “all” in root words, search results will return all root words that contain “all”, like “above all, after all, all around, all at once, etc.”

2. Look up in Any Occurrence

In this mode, the program will search the whole database for any occurrence of your queried word or words and list them, therefore it works a bit slower but returns much more comprehensive results.

3. Look up in Any Occurrence + Synonymous with

In this mode, the program will search the whole database for any occurrence of your queried word or words together with your designated synonym, and list the entries which simultaneously contain your query and the synonym. By applying wildcards in this mode, you turn Mobysaurus into a crossword puzzle solver instantly. For example, l??????” + “insect returns “ladybug” as one of the results, and “lap dog” (insect of a person).

Wildcard Search To find:
Any single character
Type ?
Any string of characters
Type *
Any single character in this range
Type like [a-z] (ranges must be in ascending order. ) or type like [a,t,d] Any single character except the characters in this range
Type like [!a-z] (ranges must be in ascending order. ) or type like [!a,t,d]V2.2 supports the following wild cards: ? * [ ] @ % # !
Unique root words suggestion Integrated Moby Buddy helps you find all the root words related to the one you just entered. This dramatically boosts the power for you. Why? Still remember the last time using a paper thesaurus? You check a root word in one page and never will have any idea if any better synonym might appear in another page under another root word. Even with a electronic thesaurus with every cross-reference, you are still facing a labyrinth of possibilities and endless mouse clicks. But with Mobysaurus & Moby Buddy, you know them all in a few seconds. Check them one by one or just some selections? It’s your choice alone.
Advanced search toolbox Very instrumental for searching into references and more.
Incremental Search You don’t have to fulfill the root word, type a few letters and then click away.
Automatic Highlighting Making it very easy for any user to pick out desired synonyms among the huge vocabulary of the English language.
Bookmark & History Lets you bookmark reference entries so you can return to them later, in much the same way that you bookmark pages on the World Wide Web with a browser. You can easily go back/forward in history with one keystroke or right-click to display the history menu.
Convenience Handy Moby is a unobtrusive system tray utility comes with Mobysaurus which allows you to find synonyms without having to start Mobysaurus, and it handles automatic clipboard look-up.
Unlimited Copy/Export Every part of the Mobysaurus database is public licensed, you can even export the whole results page to a RTF file for later reviewing or sending to a friend, or anything.
Online References Links to dozens of online reference sites may help you when you need more than Mobysaurus can offer.
Rich Offline References Includes complete Moby Thesaurus root words list, complete Roget’s Thesaurus, Titles in Roget’s Thesaurus, Official crosswords list (117,969 words, compatible with the second edition of the Official Scrabble Players Dictionary), a list of over 20,000 most common names, Places names in the USA, USA Constitution, and more.
Easy to Use No advanced options to set up, no learning curve, and instant access to all functions using shortcut keys.
Free for all No SpyWare. No AdWare. No viruses of any kind. No fee or donation requests and No Ads. Works off-line. No registry manipulation. No hidden files outside the installation folder, and if you don’t like it, it uninstalls itself like you’ve never installed it before.