Difference between NNP and NN

[Haider Ali]

Hi everyone

Can anyone please guide me that why the first noun in every sentence is always noun phrase (NNP ) in nltk pos_tag  function. 

when i run 

pos_tag(word_tokenize("Ronaldo is the best footballer"))

it give me output 

[('Ronaldo', 'NNP'),

 ('is', 'VBZ'),

 ('the', 'DT'),

 ('best', 'JJS'),

 ('footballer', 'NN')]

since Ronaldo is noun than why it give NNP. similar is the case with other sentences.

thanks

[Borislav Gankov]

Hi Haider,

It's a part-of-speech (pos) tag, namely proper noun:
http://www.ling.upenn.edu/courses/Fall_2003/ling001/penn_treebank_pos.html

phrase detection/tagging is at a later stage.

hope this helps,

BG

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[...]

NNP is for Proper noun, Singular like Ronaldo
and NN represents Noun, Singular or Mass like footballer

http://www.monlp.com/2011/11/08/part-of-speech-tags/
hope it helps.