self-assertion vs boasting

self-assertion and boasting both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-assertion	Yes	No	No	No
boasting	Yes	No	No	No

As nouns, boasting is a hypernym of self-assertion; that is, boasting is a word with a broader meaning than self-assertion:

self-assertion: the act of putting forth your own opinions in a boastful or inconsiderate manner that implies you feel superior to others
boasting: speaking of yourself in superlatives

Other hypernyms of self-assertion include boast, jactitation, self-praise.

self-assertion (noun)	boasting (noun)
the act of asserting yourself in an aggressive manner	speaking of yourself in superlatives
the act of putting forth your own opinions in a boastful or inconsiderate manner that implies you feel superior to others