footfall

As a noun footfall is

(countable) the sound made by a footstep.

As nouns the difference between footwall and footfall

is that footwall is (geology) the section of rock that extends below a diagonal fault line (the corresponding upper section being the hanging wall) while footfall is (countable) the sound made by a footstep.

In countable terms the difference between football and footfall

is that football is the ball used in any game called "football" while footfall is the sound made by a footstep.

As nouns the difference between football and footfall

is that football is a sport played on foot in which teams attempt to get a ball into a goal or zone defended by the other team while footfall is the sound made by a footstep.

As nouns the difference between taxonomy and footfall

is that taxonomy is the science or the technique used to make a classification while footfall is (countable) the sound made by a footstep.