swollen vs vain

swollen and vain both are adjectives.

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

As adjectives, swollen and vain are synonyms defined as:

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

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

swollen (adjective)	vain (adjective)
characteristic of false pride; having an exaggerated sense of self-importance	characteristic of false pride; having an exaggerated sense of self-importance
abnormally distended especially by fluids or gas	unproductive of success