A pronoun is a word that takes the place of a noun. Examples: he, she, it, they, someone, who. Pronouns can do all of the things that nouns can do. They can be subjects, direct objects, indirect objects, object of the preposition, and more. Heck, the word pronoun even has the word noun in it! Let's look at a few examples. Erik Weihenmayer is a blind mountain climber.
On October 1, 1945, Project RAND was set up under special contract to the Douglas Aircraft Company and began operations in December 1945, expending a total of $640 in its first month of operation.
Secker and Warburg published the first edition of Animal Farm in 1945 without an introduction. However, the publisher had provided space for a preface in the author's proof composited from the manuscript. For reasons unknown, no preface was supplied, and the page numbers had to be renumbered at the last minute.