philosophical theory vs philosophical doctrine

philosophical theory and philosophical doctrine both are nouns.

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

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

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

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