Which part of speech is the underlined word in the following sentence? The area is home to dozens of perennial streams.

In the sentence 'The area is home to dozens of perennial streams,' the word 'perennial' modifies the noun 'streams' by describing them as lasting through the year. A word that describes or modifies a noun is an adjective. 'Perennial' here functions as an adjective, telling us what KIND of streams they are (year-round flowing). It is not a noun (it doesn't name anything), not an adverb (it doesn't modify a verb/adjective/adverb), and not a pronoun.