One, many, and practical are all adjectives
many
many
A classic practical joke that you see a lot in television is the spring load snake in a peanut brittle can. They have had to update the cans with more modern labels to help keep this prank viable.
"That is one of his many practical jokes" is just a statement, neither an adjective nor a proverb, although the words many and practical are both adjectives.
In his book - Complete Works of Charles Dickens (Illustrated). Dickens refers to many practical jokes of the time and often endorses them. It can be assumed from many of his writing that he did indeed have a sense of humour especially so when he wrote as Boz
The adjectives in the sentence are: many, happy, talkative. The noun in the sentence is: adults. There are no pronouns in this sentence. Note: The word 'many' can function as a noun, a pronoun, or an adjective. In the example sentence, the word 'many' is an adjective that describes the noun 'adults'.
many
An adjective is a word that describes a noun or a verb. An example of a sentence that uses the word "abstract" in a sentence as an adjective would be: It is difficult for children to fully comprehend many abstract ideas.
collects
In that sentence, "Arctic" is the proper adjective.
adjective = raw adverb = often
Many people have contracted avian flu.