theological system vs theology

theological system and theology both are nouns.

Word	Noun	Adjective	Verb	Adverb
theological system	Yes	No	No	No
theology	Yes	No	No	No

As nouns, theological system and theology are synonyms defined as:

theological system and theology: a particular system or school of religious beliefs and teachings

theological system (noun)	theology (noun)
a particular system or school of religious beliefs and teachings	the learned profession acquired by specialized courses in religion (usually taught at a college or seminary)
	a particular system or school of religious beliefs and teachings
	the rational and systematic study of religion and its influences and of the nature of religious truth