Passerby vs Bypass - What's the difference?

As nouns the difference between passerby and bypass

is that passerby is alternative spelling of passer-by while bypass is a road that passes around something, such as a residential area.

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

(passersby)

Alternative spelling of passer-by .

(wikipedia bypass) (bypasses)

a road that passes around something, such as a residential area

a circumvention

a section of pipe that conducts a fluid around some other fixture

an electrical shunt

(medicine) an alternative passage created to divert a bodily fluid around a damaged organ; the surgical procedure to construct such a bypass

(es)

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

to ignore the usual channels or procedures