When children hear a new word in a familiar context, they can simply add the word to the general category without fully understanding the word. this is called

When children hear new word in a familiar concept they add that word to the general category without understanding it fully this is known as Fast mapping

Explanation:

In cognitive psychology, when children learn a new concept or word by hearing it in a familiar context, with minimal exposure and without fully understanding the concept; this hypothesized mental process is known as Fast mapping.

Or we can say, fast mapping is the ability of the children to connect a word to its meaning after little exposure, without fully understanding it.

the works of justice saves things/people

the works of service things/people

explanation:

that's the best i can word it. hope it !