This is the 10711th most frequent German word.
roberts
The word "roberts" is not a standard German word; it may be a proper noun (e.g., a name) or misspelling.
In this sentence, 'Roberts' is used as a possessive form to indicate ownership, showing that the book belongs to Robert.
Roberts Buch liegt auf dem Tisch.
Robert's book is lying on the table.
Here, 'Roberts' is used as a standalone noun to refer to a person named Roberts, highlighting usage as a proper noun.
Ich habe Roberts im Park getroffen.
I met Roberts in the park.
In this context, 'Roberts' is again a possessive form, indicating that the project is associated with Robert.