This is the 7520th most frequent Russian word.
диагнозов
Plural form of "diagnosis."
The word 'диагнозов' is used in the genitive plural form to express the concept of 'of diagnoses'.
Количество диагнозов ежегодно увеличивается.
The number of diagnoses increases yearly.
Here, 'диагнозов' again appears in the genitive plural form, describing a list belonging to a patient.
Врач озвучивает список диагнозов пациента.
The doctor announces the list of the patient's diagnoses.
In this case, 'диагнозов' is used in the genitive plural form to indicate the comparison between sets of diagnoses.