This is the 3427th most frequent Japanese word.
滝
Waterfall.
滝 refers to the natural waterfall highlighted as a scenic feature in the sentence.
滝が流れ落ちる様子は大自然の美を感じさせます。
The sight of waterfalls cascading evokes the beauty of nature.
滝 is used metaphorically here to compare the heavy flow of sweat to a waterfall.
彼の汗はまるで滝のように流れていた。
His sweat was flowing like a waterfall.
滝 is used to describe a specific location or object (the waterfall) causing the sound.