This is the 12196th most frequent Polish word.
matkobójca
A "matkobójca" is a person who kills their mother.
Here, 'matkobójca' is used as a nominative noun describing a person accused or convicted of killing their mother.
On został uznany za matkobójcę przez sąd.
He was declared a matricide by the court.
In this sentence, 'matkobójca' serves as a noun in the genitive singular form to discuss the person and their actions intellectually.
Czy można zrozumieć motywy matkobójcy?
Can one understand the motives of a matricide?
Here, 'matkobójca' is in the instrumental case, used to describe what someone is being identified as in a given context.