Onelook reverse dictionary gives you several hundreds highly relevant realted keywords for one keyword you type in. Example: pain - hurt - sting - ache - myalgia and so on Or, if you type in "green fruit", you get a list of green fruits... For "large birds" you get a list of large birds...
Dear Spirit Walker, it was nice to see your site, simple and very informative. KEEP IT UP: Best of luck to you, sm
@ slackwater Above tool has many good synonims on professional level. Like for one specific medical term, you get many other specific medical terms plus many publicly used health terms. I'm not aware of any other tool that would be so rich.