Tourists is a noun (n) in the given sentence "Millions of tourists visit these monuments every year."
What is a noun?
A noun is a word that normally features the call of a particular item or set of objects, consisting of dwelling creatures, places, actions, qualities, states of existence, or ideas. Lexical categories (elements of speech) are described in phrases of the methods wherein their individuals integrate with different forms of expressions. The syntactic policies for nouns fluctuate between languages. In English, nouns are phrases that could arise with articles and attributive adjectives and may be characteristic because of the head of a noun phrase. "As some distance as we know, each language makes a grammatical difference that looks as if a noun-verb difference."
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