What are the seasonal winds that play a large role in South Asia called?

Yes the right answer is "monsoon". I am giving below some
additional information on monsoon.

The name monsoon is
derived from a local name for these winds, which means seasonal winds. The monsoon blows
over the northern part of the Indian Ocean, especially the Arabian Sea, and over most of
the surrounding land areas.  The monsoon blows from the southwest from April to October,
and from the northeast from November to March. The southwesterly monsoon brings heavy
rains to southern and southeastern Asia, including Bangladesh, Burma, India, and
Thailand. Popularly the word monsoon is used only for these winds tha bring tain with
them.