This is the 6073rd most frequent Dutch word.
robben
"Robben" in Dutch means "seals" (the marine animal).
Here, 'robben' is used as a noun referring to seals.
De robben zwemmen in de zee.
The seals are swimming in the sea.
In this sentence, 'robben' continues to function as a noun, denoting the animal.
We zagen robben op het strand.
We saw seals on the beach.
Again, 'robben' is a noun referring to the animal, used in an educational context.