health care vs healthcare

health care and healthcare both are nouns.

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

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

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

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