Nouns

(n)treka journey by ox wagon (especially an organized migration by a group of settlers)
(n)trekany long and difficult trip

Verbs

(v)trekjourney on foot, especially in the mountains“We spent the summer trekking in the foothills of the Himalayas”
(v)trekmake a long and difficult journey“They trekked towards the North Pole with sleds and skis”