vain vs swollen-headed

vain and swollen-headed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
vain	No	Yes	No	No
swollen-headed	No	Yes	No	No

As adjectives, vain and swollen-headed are synonyms defined as:

vain and swollen-headed: characteristic of false pride; having an exaggerated sense of self-importance

Other synonyms of vain include conceited, egotistic, egotistical, self-conceited, swollen.

vain (adjective)	swollen-headed (adjective)
characteristic of false pride; having an exaggerated sense of self-importance	characteristic of false pride; having an exaggerated sense of self-importance
unproductive of success