As verbs the difference between undulating and swaying
is that undulating is while swaying is .
As an adjective undulating
is moving up and down like waves; wavy.
As a noun swaying is
the motion of something that sways.
undulating
English
Adjective
(
en adjective)
Moving up and down like waves; wavy
Forming a series of regular curves
Verb
(head)
swaying
English
Verb
(head)
Noun
(
en noun)
The motion of something that sways.
An injury caused to a horse's back by violent strains or overloading.
- (Crabb)