It depends what you mean by the phrase!
In medicine, as in "natural pass kidney stone", for example, it is an adjective. It would be clearer, grammatically, to say "naturally passed kidney stone".
In sports jargon, "natural pass" is a play, a type of pass in American football. So it is, naturally, a noun; a noun-phrase. However a noun-phrase can also used as a verb, e.g. "He natural-passed to number 41", or "I'm going to try to natural-pass to you", and in this case, it should be hyphenated. It's more clumsy this way, and for the sake of clarity, it would be better to use it as a noun; so "He did a natural pass to number 41", "I'm going to try a natural pass to you".
As a noun, natural is a common, singular, abstract noun.
Pass is a noun (a pass) and a verb (to pass).
Yes, the noun 'raw' is a common noun, a general word for something in its natural or nearly natural state.
Yes, the term 'natural resources' is a compound noun, a word made up of two or more words joined together has a meaning of its own. The compound noun 'natural resources' is an open spaced compound noun.
A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'natural wonder' is the name of a natural wonder, for example: The Grand Canyon Uluru (Ayers Rock) Victoria Falls
Pass
"Pass" can be both singular and plural. As a verb, it is singular (e.g. "I will pass the ball"). As a noun, it can be singular or plural depending on the context (e.g. "She completed a pass" or "They made several passes").
Goshen Pass Natural Area Preserve was created in 2001.
The plural form for the noun pass is passes.The plural possessive form is passes'.
The word natural is a noun and an adjective, not a verb.The noun 'natural' is a word for a person regarded as having an innate gift or talent for a particular task or activity; a sign placed before a musical note to cancel a preceding sharp or flat; a word for an Afro hairstyle.The adjective 'natural' describes a noun as existing or created by nature, not made or caused by humans; reasonable or expected in a particular situation; characterized by spontaneity and freedom from artificiality, affectation, or inhibitions.
Verb
The exact noun for wind is "air in natural motion."