Subway is a compound word.
Yes
the Japanese word for subway is : fuyukpu
Subway is a noun.
The subway was full of people.
souterrain
No, building is not a compound word.
The contraction (not a compound word) is doesn't.
Upwards is a compound word.
Yes, the word "subway" has a prefix. "Sub-" is the prefix, which means "under" or "below."
Train station. Subway is under ground and train station is overground.
The doctor hurried on to the subway right before the doors closed.
I'm gonna get a £3 sub from Subway with a free drink!