noun
1
BAD : They don't have any money to spend on luxury things.
GOOD : They don't have any money to spend on luxuries.
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luxuries (plural of luxury ) , luxury goods, luxury items (but NOT luxury things ): 'Tax on luxury goods is bound to be increased.'
2
BAD : Some successful criminals enjoy a luxury life.
GOOD : Some successful criminals enjoy a life of luxury.
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A life of luxury is a fixed phrase: 'His dream is to marry a princess and live a life of luxury.'