witnesser vs beholder

witnesser and beholder both are nouns.

Word	Noun	Adjective	Verb	Adverb
witnesser	Yes	No	No	No
beholder	Yes	No	No	No

As nouns, beholder is a hypernym of witnesser; that is, beholder is a word with a broader meaning than witnesser:

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

Other hypernyms of witnesser include observer, perceiver, percipient, speaker, talker, utterer, verbaliser, verbalizer.

witnesser (noun)	beholder (noun)
someone who sees an event and reports what happened	a person who becomes aware (of things or events) through the senses