superiority complex vs egotism

superiority complex and egotism both are nouns.

Word	Noun	Adjective	Verb	Adverb
superiority complex	Yes	No	No	No
egotism	Yes	No	No	No

As nouns, egotism is a hypernym of superiority complex; that is, egotism is a word with a broader meaning than superiority complex:

superiority complex: an exaggerated estimate of your own value and importance
egotism: an exaggerated opinion of your own importance

Other hypernyms of superiority complex include self-importance, swelled head.

superiority complex (noun)	egotism (noun)
an exaggerated estimate of your own value and importance	an exaggerated opinion of your own importance
	an inflated feeling of pride in your superiority to others