irridentism vs ism

irridentism and ism both are nouns.

Word	Noun	Adjective	Verb	Adverb
irridentism	Yes	No	No	No
ism	Yes	No	No	No

As nouns, ism is a hypernym of irridentism; that is, ism is a word with a broader meaning than irridentism:

irridentism: the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related
ism: a belief (or system of beliefs) accepted as authoritative by some group or school

Other hypernyms of irridentism include doctrine, philosophical system, philosophy, school of thought.

irridentism (noun)	ism (noun)
the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related	a belief (or system of beliefs) accepted as authoritative by some group or school