der Fischer
fisherman
A person who catches fish professionally or as a hobby.
Jeden Morgen fährt der Fischer mit seinem Kutter aufs Meer hinaus.
Every morning, the fisherman heads out to sea with his cutter.

fisherman
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fisherman
A person who catches fish professionally or as a hobby.
Jeden Morgen fährt der Fischer mit seinem Kutter aufs Meer hinaus.
Every morning, the fisherman heads out to sea with his cutter.

The word 'Fischer' (fisherman) is derived directly from the verb 'fischen' (to fish). The ending '-er' is often used in German to refer to a male person who performs a particular activity.
Wer fischt, ist ein Fischer.
Someone who fishes is a fisherman.
'Fischer' (fisherman) is not only a job title, but also one of the most common German surnames. So pay attention to the context to understand whether it refers to a person with this name or to the profession.
Mein Nachbar heißt Herr Fischer.
My neighbor's name is Mr. Fischer.
Typical expressions connected with a fisherman are 'Fische fangen' (to catch fish), 'Netze auswerfen' (to cast nets), or 'mit dem Kutter aufs Meer fahren' (to go out to sea with a cutter).
Früh am Morgen wirft der Fischer seine Netze aus.
Early in the morning, the fisherman casts his nets.
angler
'der Fischer' and 'der Angler' both have to do with catching fish. 'der Fischer' is broader: it can be a profession, for example on a boat or with nets, but it can also refer to a person who catches fish as a hobby. 'der Angler' is more specific: he fishes with a fishing rod, usually as a hobby or sport. The words can be confused because both catch fish. When it is about the profession or larger-scale fishing, 'Fischer' fits better. If someone is sitting by a lake with a fishing rod, you are more likely to say 'Angler'.

Der Fischer bringt am Morgen frischen Fisch vom Hafen zum Markt.
In the morning, the fisherman brings fresh fish from the harbor to the market.
Am See wartet der Angler ruhig, bis ein Fisch anbeißt.
At the lake, the angler waits quietly until a fish bites.