Englishfor English speakers
main
Adjective
—
The main thing is the most important or biggest one.
They turned off the main road and saw a small house.
There are many problems, but the main one is money.
what was the main reason for war in Europe in 1914?
main
Noun
—
A main is a large pipe or wire that carries gas, water, electricity, etc.
A break in a water main has closed the road.
role
Noun
—
The role of a person or thing is the job that they do in a certain situation.
In the past twenty-five years the role of women on farms had changed dramatically.
Music plays an important role in the movie.
—
role is another word for a part in a theatrical work such as a play or a ballet
Tamara Karsavina was the first to dance the role of the Firebird.
I was cast in the role of the crazy old witch in the school play.