dyspneic vs breathless

dyspneic and breathless both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dyspneic	No	Yes	No	No
breathless	No	Yes	No	No

As adjectives, dyspneic and breathless are synonyms defined as:

dyspneic and breathless: not breathing or able to breathe except with difficulty

Other synonyms of dyspneic include dyspneal, dyspnoeal, dyspnoeic.

dyspneic (adjective)	breathless (adjective)
not breathing or able to breathe except with difficulty	not breathing or able to breathe except with difficulty
	appearing dead; not breathing or having no perceptible pulse
	tending to cause suspension of regular breathing