Corpora: text search

[Leonardo Musumeci]

I'm looking for some free software for finding text(especially prefixes and suffixes)
Possibly, it should be "smart" enough to be able to distinguish verbs from nouns and adjectives etc...and especially it should not include in its search common words such as conjunctions, prepositions,etc...
Any help will be extremely appreciated

                                                             Best Regards
                                                                   Leonardo 
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