perceiver vs attender

perceiver and attender both are nouns.

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

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

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

perceiver (noun)	attender (noun)
a person who becomes aware (of things or events) through the senses	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