This is the 8291st most frequent German word.
judentums
"Judentums" means "Judaism" in English.
This use of 'Judentums' shows it serving as part of a genitive expression to indicate what is being studied.
Viele Menschen interessieren sich für das Studium des Judentums.
Many people are interested in the study of Judaism.
Here, 'Judentums' is used in the possessive genitive form, referring to 'Judaism' as a topic of discussion.
Die Geschichte des Judentums reicht Jahrtausende zurück.
The history of Judaism spans millennia.
In this sentence, 'Judentums' also functions in the genitive case to attribute the qualities of compassion and justice to the teachings of Judaism.