much

nouns

a great amount or extent
"they did much for humanity"
is a type of (narrower)
an indefinite quantity that is above the average in size or magnitude

adjectives

(quantifier used with mass nouns) great in quantity or degree or extent
"not much rain"; "much affection"; "much grain is in storage"
is derived from
antonym
is similar to
very great in quantity; overabundant
"showed overmuch affection"
is similar to
relatively much but unspecified in amount or extent
"we talked for some time"; "he was still some distance away"
is similar to
of so extreme a degree or extent
"such weeping"; "so much weeping"; "such a help"; "such grief"; "never dreamed of such beauty"
is similar to
of an incalculable amount
"untold suffering"
see also
(comparative of `much' used with mass nouns) a quantifier meaning greater in size or amount or extent or degree
"more land"; "more support"; "more rain fell"; "more than a gallon"

adverbs

to a great degree or extent
"she's much better now"
very
"he was much annoyed"
to a very great degree or extent
"I feel a lot better"; "we enjoyed ourselves very much"; "she was very much interested"; "this would help a great deal"
(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"
frequently or in great quantities
"I don't drink much"; "I don't travel much"