IPA: /ˈhaɪkər/
KK: /ˈhaɪkər/
A person who goes for long walks in the countryside or in the mountains for pleasure or exercise.
Every weekend, the hiker explores new trails in the national park.
Hiker → The word is formed from "hike" (originating from the 19th-century American English term meaning to walk or travel on foot) and the suffix "-er" (meaning a person who). A hiker is therefore a person who walks or travels on foot, typically in nature or on trails.
Think of someone who 'walks' ('hike') in nature, and the '-er' just means a person. A hiker is someone who enjoys walking outdoors.