This is the 13566th most frequent Russian word.
нациста
"Nazi" or "a supporter of Nazism."
The word 'нациста' here refers to an individual identified as a Nazi, used in the accusative singular form to indicate the person being detained.
Нациста задержали на границе.
The Nazi was detained at the border.
In this sentence, 'нациста' is in the genitive singular form, showing possession or association with dangerous ideas.
Он говорил о том, как опасны идеи нациста.
He spoke about how dangerous the ideas of the Nazi are.
Here, 'нациста' is in the accusative singular form, indicating the person with whom it was difficult to reason.