6. “Supporting or advocating;” union man, Bryan voter.
7. “Existing in or coming from;” Yellowstone geyser, California lemon.
8. “Originated or made by, named for;” Gordon Press, Harvard College.
Placing the two nouns in apposition is much the same as using the first as an adjective.
Such compounds are generally written as two words without the hyphen, but see specific rules for use of hyphens.
II Every name apparently composed of a plain noun and a noun of agent or verbal noun, but really conveying the sense of a phrase with suffix er, or, or ing, should be treated as a compound; roller distribution.
III Possessive phrases used as specific names (generally plants) are treated as compounds.
They are hyphenated unless very common, in which case they are closed up; crane’s-bill, ratsbane.
IV Any phrase used as a specific name in an arbitrary application not strictly figurative is written as a compound; blueberry, red-coat, forget-me-not.
V Any pair of words used as one name of which the second is a noun but the first not really an adjective should be written as a compound; foster-brother, down-town, after-consideration.