dyspnoeic vs breathless

dyspnoeic and breathless both are adjectives.

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

As adjectives, dyspnoeic and breathless are synonyms defined as:

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

Other synonyms of dyspnoeic include dyspneal, dyspneic, dyspnoeal.

dyspnoeic (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