Nouns

(n)mucha great amount or extent“they did much for humanity”

Adjectives

(a)much(quantifier used with mass nouns) great in quantity or degree or extent“not much rain”, “much affection”, “much grain is in storage”

Adverbs

(r)muchto a great degree or extent“she's much better now”
(r)muchincredibly“he was much annoyed”
(r)much, practically(degree adverb used before a noun phrase) for all practical purposes but not completely“much the same thing happened every time”, “practically everything in Hinduism is the manifestation of a god”
(r)much, a great deal, oftenfrequently or in great quantities“I don't drink much”, “I don't travel much”