Problem: What are the most important words?
A train traveling down the rail road tracks near some mountains.
Answer: mountain, track, train, travel

Problem: What are the most important words?
A group of vans traveling over a bridge next to train tracks.
Answer: bridge, train, travel

Problem: What are the most important words?
A tray of food that has some shrimp, bread, and other various items on it.
Answer:
food, item, tray