a question about adjectives
why we say Rose flower or red car but planet earth and not earth planet
asked Feb 27 at 05:28
sj
New member
sj
New member
2 answers 
Both 'planet' and 'Earth' (capitalized because it's a proper noun in this use) are nouns. Earth (or Mars, Mercury, etc.) defines which planet. It is the same as saying 'my brother John'.
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edited Feb 27 at 13:13
Lewis Neidhardt
Expert
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I can't think of an instance where I would say "Rose flower". Rose is not a proper noun, so it would not be capitalized. If I mention a rose, I don't need to also say that it is a flower.
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edited Feb 27 at 22:36
Patty T
Grammarly Fellow
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