A word that means, be of use would be; helpful, useful, needed
helpful, beneficial, assisting, useful,
Recycle is a word that means to use again.
The word that means unfair use of government power is "tyranny."
when you use the word "excuse you" it means you offended the person and there upset
There is no single word that means what you are looking for.
mean
Colloquial.
utilize
work
"The word peril means danger."
Some people use the word dear.
You may use the word 'sakebu.'
No, "means" is already the plural form of "mean." It refers to methods or resources used to achieve a goal, so "means" already conveys plural meaning.