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know has 21 distinct synonyms spread across 4 of its 12 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is ignore.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about
“I know that the President lied to the people”
know how to do or perform something
“She knows how to knit”
be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt
“I know that I left the key on the table”
have firsthand knowledge of states, situations, emotions, or sensations
“I know the feeling!”
accept (someone) to be what is claimed or accept his power and authority
“The Crown Prince was acknowledged as the true heir to the throne”
have fixed in the mind
“I know Latin”
have sexual intercourse with
“This student sleeps with everyone in her dorm”
know the nature or character of
“we all knew her as a big show-off”
be able to distinguish, recognize as being different
“The child knows right from wrong”
perceive as familiar
“I know this voice!”
the fact of being aware of information that is known to few people
“he is always in the know”
1 of the 12 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for know.
Synonyms, antonyms and the broader and narrower relations for know come from Princeton University’s WordNet. Full sources and licences.