attender vs auditor

attender and auditor both are nouns.

Word	Noun	Adjective	Verb	Adverb
attender	Yes	No	No	No
auditor	Yes	No	No	No

As nouns, attender and auditor are synonyms defined as:

Other synonyms of attender include hearer, listener.

attender (noun)	auditor (noun)
someone who waits on or tends to or attends to the needs of another	a qualified accountant who inspects the accounting records and practices of a business or other organization
a person who is present and participates in a meeting	someone who listens attentively
someone who listens attentively	a student who attends a course but does not take it for credit