self vs ego

self and ego both are nouns.

Word	Noun	Adjective	Verb	Adverb
self	Yes	Yes	No	No
ego	Yes	No	No	No

As nouns, self and ego are synonyms defined as:

self (noun)	ego (noun)
your consciousness of your own identity	(psychoanalysis) the conscious mind
a person considered as a unique individual	your consciousness of your own identity
	an inflated feeling of pride in your superiority to others

self (adjective)	ego (adjective)
(used as a combining form) relating to--of or by or to or from or for--the self