underpass

As nouns the difference between underpass and bypass

is that underpass is a road or a pedestrian passage in a tunnel that runs underneath a road or railroad while bypass is a road that passes around something, such as a residential area.

As a verb bypass is

to avoid an obstacle etc, by constructing or using a bypass.

As nouns the difference between footbridge and underpass

is that footbridge is a bridge over a road, railway, river, etc for pedestrians while underpass is a road or a pedestrian passage in a tunnel that runs underneath a road or railroad.

As nouns the difference between underbridge and underpass

is that underbridge is a bridge that allows traffic to pass under a road, river, railway etc while underpass is a road or a pedestrian passage in a tunnel that runs underneath a road or railroad.

As nouns the difference between overbridge and underpass

is that overbridge is a bridge that allows traffic to pass over a road, river, railway etc while underpass is a road or a pedestrian passage in a tunnel that runs underneath a road or railroad.

As a noun underpass

is a road or a pedestrian passage in a tunnel that runs underneath a road or railroad.

As a verb underpays is

third-person singular of underpay.

As nouns the difference between taxonomy and underpass

is that taxonomy is the science or the technique used to make a classification while underpass is a road or a pedestrian passage in a tunnel that runs underneath a road or railroad.