Pullulate emphasizes speed and abundance in the increase of something.

Rapid Growth

Often used figuratively to describe the rapid spread of intangible things.

Figurative Use

Can have a neutral or slightly negative connotation, suggesting overwhelming numbers.

Creates a mental image of a space filled with moving or active entities.

Implies a larger than expected quantity in a given context.

Often found in descriptions of nature and ecosystems.

Indicates biological reproduction or increase in living organisms.

Use when discussing factors that contribute to the growth of populations.