This is the 4759th most frequent Russian word.
замены
"Замены" means "replacements" or "substitutions" in English.
In this sentence, 'замены' (replacement) is used in the genitive case to indicate the 'act or process of replacing' something.
Мне нужно подумать о замене этой детали.
I need to think about replacing this part.
Here, 'замены' refers to a substituting entity or an equivalent that would take the place of the existing leader.
Эта команда пока не имеет достойной замены своему лидеру.
This team still does not have a worthy replacement for its leader.
In this construct, 'замена' is used to describe an instance or action of substitution or exchange of items.