1. underground

adjective. ['ˈʌndɝˌgraʊnd'] under the level of the ground.

Rhymes with Underground Railway

2. underground

noun. ['ˈʌndɝˌgraʊnd'] an electric railway operating below the surface of the ground (usually in a city).

3. underground

adjective. ['ˈʌndɝˌgraʊnd'] conducted with or marked by hidden aims or methods.

4. underground

noun. ['ˈʌndɝˌgraʊnd'] a secret group organized to overthrow a government or occupation force.

5. railway

noun. ['ˈreɪlˌweɪ'] a line of track providing a runway for wheels.

6. railway

noun. ['ˈreɪlˌweɪ'] line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight.