bypast

As adjectives the difference between bygone and bypast

is that bygone is having been or happened in the far past while bypast is past.

As a noun bygone

is a person or occurrence that took place in the past.

As a noun 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 an adjective bypast is

past.

As adjectives the difference between bypast and foregone

is that bypast is past while foregone is previous, former.

As a verb foregone is

past participle of lang=en.