This is the 1497th most frequent German word.
viel
"Viel" means "much" or "a lot" in English.
Here, 'viel' functions as an adverb to indicate the quantity of work performed.
Ich habe viel gearbeitet.
I have worked a lot.
In this sentence, 'viel' is used in its plural form 'viele' to modify a plural noun ('Bücher'), meaning 'many'.
Er hat viele Bücher gelesen.
He has read many books.
'Viel' is used as an adjective to express a considerable degree or amount of something positive wished ('Erfolg' meaning 'success').