truster(n = noun.person) believer - a supporter who accepts something as true;
is a kind of admirer, booster, champion, friend, protagonist, supporter
has particulars: abiogenist, apostle, colonialist, confucian, confucianist, evolutionist, imperialist, malthusian, vitalist
Derived form verb trust3
1. One who trusts, or credits. [1913 Webster]
2. One who makes a trust; -- the correlative of trustee. [1913 Webster]