This is the 12154th most frequent German word.
untersuchungsausschusses
"Untersuchungsausschusses" means "of the investigative committee" in English.
Here, "Untersuchungsausschusses" is used to indicate possession, showing that the report belongs to the investigation committee.
Der Untersuchungsausschusses Bericht wurde gestern veröffentlicht.
The investigation committee's report was published yesterday.
In this sentence, "Untersuchungsausschusses" is used in the genitive case to describe the task associated with the committee.
Die Aufgabe des Untersuchungsausschusses ist es, politische Fehlverhalten zu untersuchen.
The task of the investigation committee is to investigate political misconduct.
Here it functions as the subject in the nominative case, describing the entity expected to complete the work.