hair care vs haircare

hair care and haircare both are nouns.

Word	Noun	Adjective	Verb	Adverb
hair care	Yes	No	No	No
haircare	Yes	No	No	No

As nouns, hair care and haircare are synonyms defined as:

hair care and haircare: care for the hair: the activity of washing or cutting or curling or arranging the hair

Other synonyms of hair care include hairdressing.

hair care (noun)	haircare (noun)
care for the hair: the activity of washing or cutting or curling or arranging the hair	care for the hair: the activity of washing or cutting or curling or arranging the hair