attender vs perceiver

attender and perceiver both are nouns.

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

As nouns, perceiver is a hypernym of attender; that is, perceiver is a word with a broader meaning than attender:

attender: someone who listens attentively
perceiver: a person who becomes aware (of things or events) through the senses

Other hypernyms of attender include beholder, observer, percipient.

attender (noun)	perceiver (noun)
someone who waits on or tends to or attends to the needs of another	a person who becomes aware (of things or events) through the senses
a person who is present and participates in a meeting
someone who listens attentively