plural diversities
1 : the quality or state of having many different forms, types, ideas, etc.
[noncount]
The island has more diversity in plant life than other islands nearby.
biological/genetic/linguistic diversity
There was some diversity of opinion about what should be done. [=people had different opinions about what should be done]
[count] — usually singular
The area has a great diversity [=variety] of birds.
She has a wide diversity of interests. [=she has many different interests]
2 : the state of having people who are different races or who have different cultures in a group or organization
[noncount]
The city is known for its cultural/ethnic diversity.
The school aims for diversity in its student population.
[count] — usually singular
There is a greater diversity in the city's population now.