wave theory vs undulatory theory

wave theory and undulatory theory both are nouns.

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

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

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

Other synonyms of wave theory include wave theory of light.

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