emphasize vs stress

emphasize is not a noun while stress is a noun.

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

As verbs, emphasize and stress are synonyms defined as:

Other synonyms of emphasize include accent, accentuate, emphasise, punctuate.

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

Other hypernyms of emphasize include accent, accentuate, emphasise, emphasize, punctuate.

emphasize (noun)	stress (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

emphasize (verb)	stress (verb)
to stress, single out as important	to suffer from stress
give extra weight to (a communication)	to stress, single out as important
	put stress on; utter with an accent
	test the limits of