fundamentalism vs ideology

fundamentalism and ideology both are nouns.

Word	Noun	Adjective	Verb	Adverb
fundamentalism	Yes	No	No	No
ideology	Yes	No	No	No

As nouns, ideology is a hypernym of fundamentalism; that is, ideology is a word with a broader meaning than fundamentalism:

fundamentalism: the strict adherence to the basic principles or doctrines of a religion, ideology, etc.
ideology: an orientation that characterizes the thinking of a group or nation

Other hypernyms of fundamentalism include political orientation, political theory.

fundamentalism (noun)	ideology (noun)
a form of Protestantism that takes the interpretation of every word in the sacred texts as literal truth	an orientation that characterizes the thinking of a group or nation
the strict adherence to the basic principles or doctrines of a religion, ideology, etc.	imaginary or visionary theorization