is a specific kind of: disagreeable person, unpleasant person.

is a broader term that covers: blowhard, boaster, braggart, bragger, line-shooter, vaunter | egomaniac | exhibitionist, show-off | know-all, know-it-all | megalomaniac | miles gloriosus | popinjay.

derivation: egocentrism, egoism, self-centeredness, self-concern, self-interest | egotism, self-importance, swelled head | ego, egotism, self-importance | egocentric, egoistic, egoistical, self-centered, self-centred | conceited, egotistic, egotistical, self-conceited, swollen, swollen-headed, vain | egotistic, egotistical, narcissistic, self-loving.