This is the 4843rd most frequent Russian word.
инвестором
The Russian word "инвестором" means "investor" (in the instrumental case).
In this sentence, 'инвестором' is used as a predicate nominative indicating the role of the subject.
Он является инвестором этого проекта.
He is an investor in this project.
Here, 'инвестором' is used as an instrumental case object to denote the means by which something is achieved.
Компания была основана с помощью инвестором предоставленных средств.
The company was founded with the funds provided by the investor.
In this case, 'инвестором' is in the instrumental case showing with whom the agreement was made.