Is there open database with English words with grammatical classification?
I mean the list of words, with the information, which part of speech this word is (f.e. verb, noun, pronoun etc.).
Open Data Stack Exchange is a question and answer site for developers and researchers interested in open data. It only takes a minute to sign up.
Sign up to join this communityThere are plenty of open corpora (databases) of English words available. Specifically, take a look at Brown and WordNet.
Check out Natural Language Toolkit it is written in Python and has those corpora available for download. It is one of the most popular packages to work with human languages data.
If you prefer to use web based API, take a look at Wordnik API