This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Someone who is materialistic, concerned only with material possessions.

n. A follower or proponent of philosophical materialism.

n. One who denies the existence of spiritual substances or agents, and maintains that spiritual phenomena, so called, are the result of some peculiar organization of matter. A believer in philosophical materialism.

n. One who holds to the existence of matter, as distinguished from the idealist, who denies it.

n. One who holds or advocates any form of metaphysical materialism.

n. One who is absorbed by material interests; one who takes a low, material view of life.

Of or pertaining to materialism; materialistic.

n. someone who thinks that nothing exists but physical matter

n. someone with great regard for material possessions

"First of all, I resent the "hard-headed" modifier to the term materialist, not so subtly suggesting that there is something wrong with materialism (in the sense of a naturalistic philosophy, not in that of Madonna's "Material Girl")."

disbeliever    unbeliever    nonbeliever    capitalist   

imperialist   

Aristotelian    mechanistic    optimist    monistic    existentialist