attending vs appearing

attending and appearing both are nouns.

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

As nouns, appearing is a hyponym of attending; that is, appearing is a word with a more specific, narrower meaning than attending:

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

Other hyponyms of attending include appearance, coming into court, presence, turnout.

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

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