stress vs afflict

stress is a noun but afflict is not a noun.

Word	Noun	Adjective	Verb	Adverb
stress	Yes	No	Yes	No
afflict	No	No	Yes	No

As verbs, afflict is a hypernym of stress; that is, afflict is a word with a broader meaning than stress:

stress (noun)	afflict (noun)
the relative prominence of a syllable or musical note (especially with regard to stress or pitch)
(physics) force that produces strain on a physical body
(psychology) a state of mental or emotional strain or suspense
difficulty that causes worry or emotional tension
special emphasis attached to something

stress (verb)	afflict (verb)
to suffer from stress	cause physical pain or suffering in
to stress, single out as important	cause great unhappiness for; distress
put stress on; utter with an accent
test the limits of