undulatory theory vs wave theory

undulatory theory and wave theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
undulatory theory	Yes	No	No	No
wave theory	Yes	No	No	No

As nouns, undulatory theory and wave theory are synonyms defined as:

undulatory theory and wave theory: (physics) the theory that light is transmitted as waves

Other synonyms of undulatory theory include wave theory of light.

undulatory theory (noun)	wave theory (noun)
(physics) the theory that light is transmitted as waves	(physics) the theory that light is transmitted as waves