The noun trust can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be trust. However, in more specific contexts, the plural form can also be trusts e.g. in reference to various types of trusts or a collection of trusts.
Is a trust singular or plural?
1 trust /ˈtrʌst/ noun. plural trusts. 1 trust. /ˈtrʌst/ plural trusts.
Is trust countable or uncountable?
trust. 1[uncountable] trust (in somebody/something) the belief that someone or something is good, sincere, honest, etc.