What is the parts of speech of the word sick?

The Word "sick" can function as both an adjective and a noun. As an adjective, it describes a state of illness or feeling unwell (e.g., "I feel sick"). As a noun, it can refer to a person who is ill (e.g., "The sick need care"). Additionally, in informal contexts, "sick" can also serve as slang to describe something impressive or cool.