In the following code, why does nltk think 'fish' is an adjective and not a noun?
>>> import nltk
>>> s = "a woman needs a man like a fish needs a bicycle"
>>> nltk.pos_tag(s.split())
[('a', 'DT'), ('woman', 'NN'), ('needs', 'VBZ'), ('a', 'DT'), ('man', 'NN'), ('like', 'IN'), ('a', 'DT'), ('fish', 'JJ'), ('needs', 'NNS'), ('a', 'DT'), ('bicycle', 'NN')]
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