theology vs system of rules

theology and system of rules both are nouns.

Word	Noun	Adjective	Verb	Adverb
theology	Yes	No	No	No
system of rules	Yes	No	No	No

As nouns, system of rules is a hypernym of theology; that is, system of rules is a word with a broader meaning than theology:

Other hypernyms of theology include system.

theology (noun)	system of rules (noun)
the learned profession acquired by specialized courses in religion (usually taught at a college or seminary)	a complex of methods or rules governing behavior
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