This is the 11979th most frequent Russian word.
защитниках
"Defenders" or "protectors" (plural form).
The word 'защитниках' refers to individuals protecting nature.
Группа людей говорила о защитниках природы.
A group of people was talking about nature defenders.
Here, 'защитниках' denotes individuals who defend a city in a historical or military context.
Он был одним из защитниках города во время осады.
He was one of the defenders of the city during the siege
In this instance, 'защитниках' is used to describe people defending fortresses in a historical context.