philosophical doctrine vs philosophical theory

philosophical doctrine and philosophical theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
philosophical doctrine	Yes	No	No	No
philosophical theory	Yes	No	No	No

As nouns, philosophical doctrine and philosophical theory are synonyms defined as:

philosophical doctrine and philosophical theory: a doctrine accepted by adherents to a philosophy

philosophical doctrine (noun)	philosophical theory (noun)
a doctrine accepted by adherents to a philosophy	a doctrine accepted by adherents to a philosophy