Know vs. Sure — What's the Difference?

Be aware of through observation, inquiry, or information

Confident, as of something awaited or expected

Have developed a relationship with (someone) through meeting and spending time with them; be familiar or friendly with

Impossible to doubt or dispute; certain

Have sexual intercourse with (someone).

Bound to come about or happen; inevitable

To perceive directly; grasp in the mind with clarity or certainty.

Having one's course directed; destined or bound

To regard as true beyond doubt

Certain not to miss, slip, or err; steady

To have a practical understanding of, as through experience; be skilled in

Not hesitating or wavering; firm

To have fixed in the mind

Worthy of being trusted or depended on; reliable

To have experience of

Free from or marked by freedom from doubt

To perceive as familiar; recognize

Careful to do something

To be acquainted with

(Obsolete) Free from harm or danger; safe.

To be able to distinguish; recognize as distinct

Surely; certainly.

To discern the character or nature of

Physically secure and certain, non-failing, reliable.

(Archaic) To have sexual intercourse with.

Certain in one's knowledge or belief.

To possess knowledge, understanding, or information.

(followed by a to infinitive) Certain to act or be a specified way.

To be cognizant or aware.

(obsolete) Free from danger; safe; secure.

(transitive) To perceive the truth or factuality of; to be certain of or that.

(obsolete) Betrothed; engaged to marry.

(transitive) To be aware of; to be cognizant of.

(modal adverb) Without doubt, certainly.

(transitive) To be acquainted or familiar with; to have encountered.

(archaic) Without fail, surely.

(transitive) To experience.

Yes, expressing noncommittal agreement or consent.

(transitive) To be able to distinguish, to discern, particularly by contrast or comparison; to recognize the nature of.}}

Yes; of course.

(transitive) To recognize as the same (as someone or something previously encountered) after an absence or change.

You're welcome; polite response to being thanked.

To understand or have a grasp of through experience or study.

Certainly knowing and believing; confident beyond doubt; implicity trusting; unquestioning; positive.

To have sexual relations with. This meaning normally specified in modern English as e.g. to ’know someone in the biblical sense’ or to ‘know biblically.’

Certain to find or retain; as, to be sure of game; to be sure of success; to be sure of life or health.

(intransitive) To have knowledge; to have information, be informed.

Fit or worthy to be depended on; certain not to fail or disappoint expectation; unfailing; strong; permanent; enduring.

(intransitive) To be or become aware or cognizant.

Betrothed; engaged to marry.

To be acquainted (with another person).

Free from danger; safe; secure.

(transitive) To be able to play or perform (a song or other piece of music).

In a sure manner; safely; certainly.

(rare) Knowledge; the state of knowing.

Having or feeling no doubt or uncertainty; confident and assured;

Knowledge; the state of knowing; now confined to the fixed phrase ‘in the know’

Exercising or taking care great enough to bring assurance;

Knee.

Certain to occur; destined or inevitable;

To perceive or apprehend clearly and certainly; to understand; to have full information of; as, to know one's duty.

Physically secure or dependable;

To be convinced of the truth of; to be fully assured of; as, to know things from information.

Capable of being depended on;

To be acquainted with; to be no stranger to; to be more or less familiar with the person, character, etc., of; to possess experience of; as, to know an author; to know the rules of an organization.

(of persons) worthy of trust or confidence;

To recognize; to distinguish; to discern the character of; as, to know a person's face or figure.

Infallible or unfailing;

To have sexual intercourse with.

Certain not to fail;

To have knowledge; to have a clear and certain perception; to possess wisdom, instruction, or information; - often with of.

Impossible to doubt or dispute;

To be assured; to feel confident.

Definitely or positively (`sure' is sometimes used informally for `surely');

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;

Be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt;

Be familiar or acquainted with a person or an object;

Have firsthand knowledge of states, situations, emotions, or sensations;

Accept (someone) to be what is claimed or accept his power and authority;

Have fixed in the mind;

Have sexual intercourse with;

Know the nature or character of;

Be able to distinguish, recognize as being different;

Perceive as familiar;