childcare vs child care

childcare and child care both are nouns.

Word	Noun	Adjective	Verb	Adverb
childcare	Yes	No	No	No
child care	Yes	No	No	No

As nouns, childcare and child care are synonyms defined as:

childcare and child care: a service involving care for other people's children

childcare (noun)	child care (noun)
a service involving care for other people's children	a service involving care for other people's children