As nouns the difference between sud and shud
is that sud
is a bubble of lather or foam (the singular of suds) while shud
is a shed.
As a verb shud is
form of should|lang=en.
Other Comparisons: What's the difference?
(informal) A bubble of lather or foam (the singular of suds).
From the Late (etyl) schudde.
(obsolete, outside, Derbyshire, East Anglia, Herefordshire, Yorkshire) A (l).
shud]” listed in the [2nd ed., 1989