Mapping Words Through Wiktionary

[caddy_caddy]

Hi all,
I once found an online dictionary that does a mapping or network for related words . It's incredible but can't remember it. I thought it's Wiktionary and tried but didn't get the mapping . I have been looking for hours and searching in vain . Do you know any online dictionary that provides this service?
Thanks in advance

[Sido]

Here try these:
http://www.synonym.com/
http://dictionary.sensagent.com/
http://thesaurus.com/

Hope they help :)