Cascades is a noun and a verb (third person singular conjugation of cascade).
It is part of the Cascades. More specifically, it is part of the Cascade Volcanic Arc.
No
Mount Mazama is part of the Cascade Mountain Range
The part of speech for this particular word is a noun.
part of speech
Washington, Oregon, and the northernmost part of California.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The Rocky Mountains, Sierra Nevada, and Cascade Range are part of the Cordilleras.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.