pos tag description example nn nounsingular or mass book nns noun plural books nnp proper nounsingular sean nnps proper nounplural vikings pdt predeterminer both the boys pos possessive ending friend' prp personal pronoun iheit prppossessive pronoun myhis rb adverb howeverusuallynaturallyheregood rbr adverbcomparative better rbs adverbsuperlative best rp particle give up to to to goto him uh interjection uhhuhhuhh vb verbbase form take vbd verbpast tense took vbg verbgerund/present participle taking vbn verbpast participle taken vbp verbsingularpresentnon- take vbz verbthird person singularpresent takes wdt wh-determiner which wp wh-pronoun whowhat wppossessive wh-pronoun whose wrb wh-abverb wherewhen with these tags it is pretty easy to filter the desired tags from the output of pos_ tag(we simply have to count all the words whose tags start with nn for nounsvb for verbsjj for adjectivesand rb for adverbs