listener vs attender

listener and attender both are nouns.

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

As nouns, listener and attender are synonyms defined as:

Other synonyms of listener include auditor, hearer.

listener (noun)	attender (noun)
someone who listens attentively	someone who waits on or tends to or attends to the needs of another
	a person who is present and participates in a meeting
	someone who listens attentively