chef
In Italian, the word 'chef' is used exactly as it is in English, with the same pronunciation. It refers to a professional cook, typically the one in charge of a kitchen in a restaurant or hotel. However, in Italian, the term 'cuoco' or 'cuoca' is more commonly used to refer to a cook in general, while 'chef' is reserved for those with a higher level of expertise and responsibility.
My friend is a great chef.
This sentence is straightforward and shows the use of 'chef' as a noun. The adjective 'ottimo' is put in front of the noun it modifies, unlike in English where it comes after the noun.
I want to become a chef.
In this sentence, 'chef' appears as the noun after the verb 'diventare' meaning 'to become'. Here, 'uno' is used before 'chef' it is used as an indefinite article before a masculine noun that begins with a consonant.
The chef prepared a delicious Italian meal.
In this sentence, 'chef' is used as a noun referring to a person. Please note, 'chef' in Italian might not change form for gender, but the article 'la' indicates that the chef is female.