As nouns the difference between capability and competency is that capability is the power or ability to generate an outcome while competency is (obsolete) a sufficient supply (of).
Category: capability
Functionality vs Capability – What’s the difference?
As nouns the difference between functionality and capability is that functionality is the ability to perform a task or function; that set of functions that something is able or equipped to perform while capability is the power or ability to generate an outcome.
Service vs Capability – What’s the difference?
As nouns the difference between service and capability is that service is an act of being of assistance to someone or service can be service tree while capability is the power or ability to generate an outcome.
As a verb service is to serve.