This is the 1611th most frequent Polish word.
lekarzy
"Doctors" (genitive or accusative plural form of "lekarz").
Here, 'lekarzami' refers to the plural instrumental form of 'doctor' indicating the people with whom collaboration is happening.
Współpracuję z wieloma lekarzami w szpitalu.
I collaborate with many doctors in the hospital.
In this case, 'lekarzy' is the genitive plural form of 'doctor,' expressing a quantity or lack thereof.
Lekarzy w naszym mieście jest niewielu.
There are few doctors in our city.
Here, 'lekarzy' serves as the accusative plural form of 'doctor,' indicating whom the subject met.