witness vs perceiver

witness and perceiver both are nouns.

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

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

witness: someone who sees an event and reports what happened
perceiver: a person who becomes aware (of things or events) through the senses

Other hypernyms of witness include beholder, observer, percipient, speaker, talker, utterer, verbaliser, verbalizer.

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

witness: a close observer; someone who looks at something (such as an exhibition of some kind)
perceiver: a person who becomes aware (of things or events) through the senses

Other hypernyms of witness include beholder, observer, percipient.

witness (noun)	perceiver (noun)
testimony by word or deed to your religious faith	a person who becomes aware (of things or events) through the senses
someone who sees an event and reports what happened
a close observer; someone who looks at something (such as an exhibition of some kind)
(law) a person who attests to the genuineness of a document or signature by adding their own signature
(law) a person who testifies under oath in a court of law

witness (verb)	perceiver (verb)
be a witness to
perceive or be contemporaneous with