Letters that make metro
o, e, m, r, t are letters that make 'metro'
metros is a word created by adding a letter to 'metro'
1 possible definitions for 'metro'
Under this definition, metro is a noun and has the following properties:
tube, underground, subway system, subway have the same meaning as 'metro'
'metro' can be a type of railroad, railway, railroad line, railway system, railway line.
"in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"