stress vs emphasis

stress and emphasis both are nouns.

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

As nouns, stress and emphasis are synonyms defined as:

stress and emphasis: the relative prominence of a syllable or musical note (especially with regard to stress or pitch)

Other synonyms of stress include accent.

As nouns, emphasis is a hypernym of stress; that is, emphasis is a word with a broader meaning than stress:

Other hypernyms of stress include accent.

stress (noun)	emphasis (noun)
the relative prominence of a syllable or musical note (especially with regard to stress or pitch)	intensity or forcefulness of expression
(physics) force that produces strain on a physical body	the relative prominence of a syllable or musical note (especially with regard to stress or pitch)
(psychology) a state of mental or emotional strain or suspense	special and significant stress by means of position or repetition e.g.
difficulty that causes worry or emotional tension	special importance or significance
special emphasis attached to something

stress (verb)	emphasis (verb)
to suffer from stress
to stress, single out as important
put stress on; utter with an accent
test the limits of