seer vs beholder

seer and beholder both are nouns.

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

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

seer: an observer who perceives visually
beholder: a person who becomes aware (of things or events) through the senses

Other hypernyms of seer include observer, perceiver, percipient.

seer (noun)	beholder (noun)
a person with unusual powers of foresight	a person who becomes aware (of things or events) through the senses
an authoritative person who divines the future
an observer who perceives visually