I Need Detailed Grammatical English Dictionary?

Hi! I am student of BBA honors and also a freelance web designer. My time table is very much tight. i don't get time to do ignments. What i want is a detailed grammatical dictionary which tell me details about a word e.g if about much then which part of speech? and sub type of speech? I know http://dictionary.reference.com/ but its not telling me about sub type for example if it tell adjective then does not tell numeral adjective or adjective of quantity.