der Walker
walker
A person who does the sport of walking (fast walking).
Jeden Morgen trifft sich eine Gruppe von Walkern im Stadtpark.
Every morning, a group of walkers meets in the city park.

walker / rollator / fuller
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walker
A person who does the sport of walking (fast walking).
Jeden Morgen trifft sich eine Gruppe von Walkern im Stadtpark.
Every morning, a group of walkers meets in the city park.

You can recognize the meaning of 'Walker' from the context. If it is about sports and movement, it refers to a person. In connection with seniors or medical assistance, it is a walking aid. In historical texts about fabric production, it refers to the craftsman.
Die Walker trainieren für einen Halbmarathon.
The walkers are training for a half marathon.
In the meaning 'Sportler' (athlete), 'Walker' is an English loanword derived directly from the sport 'Walking' (fast walking).
Im Park sieht man morgens viele Jogger und Walker.
In the park, you see many joggers and walkers in the morning.
When 'Walker' means a walking aid, it is often used with verbs such as 'benutzen' (to use), 'brauchen' (to need), or the phrase 'auf einen Walker angewiesen sein' (to depend on a walker).
Seit dem Sturz ist er auf einen Walker angewiesen.
Since the fall, he has depended on a walker.
The meaning 'Handwerker' (craftsman) is outdated today and appears almost only in historical or technical texts about medieval textile crafts.
Das Museum zeigte die alten Werkzeuge eines Walkers.
The museum displayed a fuller’s old tools.
jogger / joggers
'der Walker' and 'der Jogger' both refer to people who move as exercise. The difference lies in the type of movement: a walker walks fast, but still walks. A jogger runs at an easy pace. The words can be confused because both can be endurance exercise in the park or on paths. If both feet briefly leave the ground while moving, 'Jogger' is more likely to fit. If it is fast walking, 'Walker' fits.

Der Walker bewegt die Arme kräftig und geht schnell am See entlang.
The walker swings his arms strongly and walks quickly along the lake.
Am Morgen läuft ein Jogger langsam durch den Park.
In the morning, a jogger runs slowly through the park.