This is the 9287th most frequent Japanese word.
登り
"登り" means "ascent" or "climb."
Here, '登り' metaphorically represents the action of the sun rising or ascending in the sky during morning hours.
太陽が朝、登り始める。
The sun begins to rise in the morning.
Here, '登り' describes the incline of the path, indicating an upward slope along which one travels.
登り道を歩いて行きます。
I walk along the uphill path.
In this sentence, '登り' is used as part of '山登り', meaning mountain climbing, referring to the action of climbing a mountain.