Poor boy and Sub

Poor boy noun - A large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States.

Sub is a synonym for poor boy. In some cases you can use "Sub" instead a noun phrase "Poor boy".

Sub noun - A large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States.

Poor boy is a synonym for sub. You can use "Poor boy" instead a noun "Sub".