看看 WIKI 的解释:A mutual fund is a type of professionally managed collective investment vehicle that pools money from many investors to purchase securities
A unit trust is a form of collective investment constituted under a trust deed.
在大马,我们用的名词是 UNIT TRUST FUND ,单位信托基金
看看路透社解释:在英国, unit trust等同mutual fund.---------mutual fund(共同基金).