I believe the answer is: there is not universally accepted term for people with low intelligence
A term is considered to be universally accepted if you can say that term in all society and nobody would get offended. Most people in different societies would see saying a term for low intelligence people as rude and often unnecessary/not needed.
trading in bonds ---> capital gains and interest income
buying and selling properties > capital gains only
trading in company stocks > capital gains and dividends
opening a CD account > interest income only
Explanation: