Similar

hello : )
is there a way i can type a word into a text box for example "purple" and then click submit and it will display similar words e.g Prple, Puurple, Perple
thank you
:wave:Yes - you're thinking of a thesaurus. this (http://www.codeproject.com/cs/algorithms/tst.asp) link looks promising. You will, of course, need to build the backing thesaurus definition yourself.

Some more hits: http://www.google.co.za/search?q=c%23+thesaurus+lookup&hl=en&client=firefox-a&rls=org.mozilla:en-US:official&hs=5mZ&start=10&sa=N
And specifically to CodeProject:
http://www.google.co.za/search?q=c%23+thesaurus+lookup+site:codeproject.com&hl=en&client=firefox-a&rls=org.mozilla:en-US:official&hs=5mZ&start=10&sa=N
What is the logic behind Prple, Puurple and Perple being similar to Purple?
they are misspelt errors
So what you're looking for is a common misspelling database. You'll probably have to do a search for this on google and compile the list into a database for yourself.