This is the 13723rd most frequent Russian word.
нервы
"Nerves" - refers to a person's mental state or emotional tension.
Here, 'нервы' is used literally to refer to someone's nervous system and state of tension.
У него всегда напряжённые нервы.
He always has tense nerves.
In this sentence, 'нервы' figuratively describes emotional irritation or annoyance.
Она играет на моих нервах, постоянно жалуясь.
She's getting on my nerves, constantly complaining.
Here, 'нервы' is referred to as a characteristic of someone's mental resilience or stability.