appearing vs attending

appearing and attending both are nouns.

Word	Noun	Adjective	Verb	Adverb
appearing	Yes	No	No	No
attending	Yes	Yes	No	No

As nouns, attending is a hypernym of appearing; that is, attending is a word with a broader meaning than appearing:

appearing: formal attendance (in court or at a hearing) of a party in an action
attending: the act of being present (at a meeting or event etc.)

Other hypernyms of appearing include attendance.

appearing (noun)	attending (noun)
formal attendance (in court or at a hearing) of a party in an action	the act of being present (at a meeting or event etc.)
	the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others

appearing (adjective)	attending (adjective)
	giving practical help to