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Investigation (Noun)

The work of inquiring into something thoroughly and systematically.

Nouns denoting acts or actions.

The detective agency conducted a thorough investigation into the mysterious disappearance of the businessman.
The company launched an investigation into the allegations of financial misconduct by one of its employees.
The government announced a full investigation into the causes of the devastating oil spill.
The teacher undertook an investigation into the reasons behind the sudden decrease in student motivation.
The journalist spent months conducting an in-depth investigation into the claims of corruption within the government department.

An inquiry into unfamiliar or questionable activities; "there was a congressional probe into the scandal".

Nouns denoting cognitive processes and contents.

The police launched a thorough investigation into the mysterious circumstances surrounding the disappearance of the CEO.
A team of journalists conducted their own investigation into the allegations of corruption within the city council.
The company was subject to a government investigation over concerns about its environmental impact.
A parliamentary committee was set up to oversee the investigation into the misuse of public funds.
The detective was assigned to lead the murder investigation and gather evidence from the crime scene.