hair care vs tending

hair care and tending both are nouns.

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

As nouns, tending is a hypernym of hair care; that is, tending is a word with a broader meaning than hair care:

hair care: care for the hair: the activity of washing or cutting or curling or arranging the hair
tending: the work of providing treatment for or attending to someone or something

Other hypernyms of hair care include aid, attention, care.

hair care (noun)	tending (noun)
care for the hair: the activity of washing or cutting or curling or arranging the hair	the work of providing treatment for or attending to someone or something

hair care (adjective)	tending (adjective)
	(usually followed by `to') naturally disposed toward