Chap is a colloquial term used to refer to a man or a boy, informally. However, there are numerous synonyms one can use to substitute for this word, depending on the context. For instance, dude, lad, fellow, bloke, mate, and guy can be used to describe a younger man or a boy. In contrast, older men can be referred to as gentlemen, dudes, old-timers, gents, among others. Other slang words, such as bro, homie, amigo, and pal, are also commonly used terms to describe close friends or acquaintances. Additionally, certain professions or lifestyles can be used to substitute for the term chap, such as cowboy, mechanic, or even hipster, depending on the situation.