hairdressing vs tending

hairdressing and tending both are nouns.

Word	Noun	Adjective	Verb	Adverb
hairdressing	Yes	No	No	No
tending	Yes	Yes	No	No

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

hairdressing: 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 hairdressing include aid, attention, care.

hairdressing (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
a toiletry for the hair

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