Synonyms for Mercenary (same or very similar meaning)
WordNet sense 1 (a person hired to fight for another country than their own):
soldier of fortuneWordNet sense 2 (marked by materialism):
materialistic, worldly-mindedWordNet sense 3 (characteristic of or devoted to the temporal world):
worldlyWordNet sense 4 (used of soldiers hired by a foreign army):
freelanceWordNet sense 5 (marked by the reception of pay):
paidWordNet sense 6 (profit oriented):
mercantile, moneymakingFrom the ODE community, based on WordNetadd/edit