skin care vs tending

skin care and tending both are nouns.

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

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

skin care: care for the skin
tending: the work of providing treatment for or attending to someone or something

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

skin care (noun)	tending (noun)
care for the skin	the work of providing treatment for or attending to someone or something

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