healthcare vs health care

healthcare and health care both are nouns.

Word	Noun	Adjective	Verb	Adverb
healthcare	Yes	No	No	No
health care	Yes	No	No	No

As nouns, healthcare and health care are synonyms defined as:

healthcare and health care: the preservation of mental and physical health by preventing or treating illness through services offered by the health profession

healthcare (noun)	health care (noun)
the preservation of mental and physical health by preventing or treating illness through services offered by the health profession	social insurance for the ill and injured
	the preservation of mental and physical health by preventing or treating illness through services offered by the health profession