stress vs play down

stress is a noun but play down is not a noun.

Word	Noun	Adjective	Verb	Adverb
stress	Yes	No	Yes	No
play down	No	No	Yes	No

As verbs, play down is a hyponym of stress; that is, play down is a word with a more specific, narrower meaning than stress:

stress (noun)	play down (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)	play down (verb)
to suffer from stress	understate the importance or quality of
to stress, single out as important
put stress on; utter with an accent
test the limits of