know-all vs egotist

know-all and egotist both are nouns.

Word	Noun	Adjective	Verb	Adverb
know-all	Yes	No	No	No
egotist	Yes	No	No	No

As nouns, egotist is a hypernym of know-all; that is, egotist is a word with a broader meaning than know-all:

know-all: someone who thinks he knows everything and refuses to accept advice or information from others
egotist: a conceited and self-centered person

Other hypernyms of know-all include egoist, swellhead.

know-all (noun)	egotist (noun)
someone who thinks he knows everything and refuses to accept advice or information from others	a conceited and self-centered person