This is the 13298th most frequent Russian word.
мощи
Relics, specifically sacred remains of saints.
The word 'мощи' here refers to the remains of saints, often kept as relics of religious significance.
Я посетил монастырь, чтобы увидеть святые мощи.
I visited the monastery to see the sacred relics.
In this case, 'мощи' metaphorically indicates the power or capability of engines.
Эти мощи двигателей позволяют автомобилям развивать большую скорость.
These engine powers allow cars to achieve high speeds.
Here, 'мощи' is used informally to describe someone's physical strength.