know vs agnize

know is a noun but agnize is not a noun.

Word	Noun	Adjective	Verb	Adverb
know	Yes	No	Yes	No
agnize	No	No	Yes	No

As verbs, agnize is a hyponym of know; that is, agnize is a word with a more specific, narrower meaning than know:

know: be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about
agnize: be fully aware or cognizant of

Other hyponyms of know include keep track, agnise, realise, realize, recognise, recognize.

As verbs, agnize is a hypernym of know; that is, agnize is a word with a broader meaning than know:

Other hypernyms of know include agnise, realise, realize, recognise, recognize.

know (noun)	agnize (noun)
the fact of being aware of information that is known to few people

know (verb)	agnize (verb)
be familiar or acquainted with a person or an object	be fully aware or cognizant of
be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about
know how to do or perform something
have firsthand knowledge of states, situations, emotions, or sensations
accept (someone) to be what is claimed or accept his power and authority
know the nature or character of
be able to distinguish, recognize as being different
perceive as familiar
have fixed in the mind
have sexual intercourse with