"Hij is een vakman."
Vertaling:He is a professional.
Professional is dat je ergens goed in bent je bent dan professioneel in bijv. bouwen
From a practical point of view, at least in North America, ...tradesman...should be acceptable, although rejected by Duo. In general, ....professional...is reserved for the professions, ie., doctors, lawyer,s, public accountants, and professional engineer. A carpenter or mason is never referred to a a professional, they are considered tradesmen. Although all workers are...werkers... in the literal sense, in practice they would be referred to a laborers, i.e., unskilled workers. May be a doctor would be considered a...vakman...in the Netherlands, he would never be considered a tradesman in the Anglo world, although ...medicine...is his trade.