walker
n. countable B1 Intermediate US //ˈwɔkɝ// UK //wˈɔːkɐ// walk·er
n. a person who travels on foot for exercise or fun. It can also mean a metal frame that helps someone walk if they have trouble moving.
n. a person who walks, especially for exercise or recreation; alternatively, a wheeled or stationary frame used as a mobility aid for the elderly or disabled.
The park is full of walkers on Sunday mornings.
After her hip surgery, she used a walker to move around the house safely until she regained her strength.
The trail is popular with serious walkers who appreciate the steep incline and the panoramic views of the valley below.
From Hookey Walker.
From Walk(ing Liberty) + -er.
Usage
When referring to the mobility aid, it is often called a 'walking frame' in British English.