Sister vs. Friend — What's the Difference?

A sister is a woman or girl who shares one or more parents with another individual. The male counterpart is a brother.

A person whom one knows, likes, and trusts.

A female having the same parents as another or one parent in common with another.

A person whom one knows; an acquaintance.

A kinswoman.

A person with whom one is allied in a struggle or cause; a comrade.

A woman fellow member, as of a sorority.

One who supports, sympathizes with, or patronizes a group, cause, or movement

A fellow woman.

Friend A member of the Society of Friends; a Quaker.

A close woman friend or companion.

(Informal) To add (someone) as a friend on a social networking website.

A fellow African American woman or girl.

(Archaic) To befriend.

A woman who advocates, fosters, or takes part in the feminist movement.

A person, typically someone other than a family member, spouse or lover, whose company one enjoys and towards whom one feels affection.

(Informal) Used as a form of address for a woman or girl.

An associate who provides assistance.

A member of a religious order of women; a nun.

A person with whom one is vaguely or indirectly acquainted.

Used as a form of address for such a woman, alone or followed by the woman's name.

A person who backs or supports something.

Chiefly British A nurse, especially the head nurse in a ward.

(informal) An object or idea that can be used for good.

One identified as female and closely related to another

Used as a form of address when warning someone.

(Architecture) A beam or other structural member affixed to another as a supplementary support.

(object-oriented programming) A function or class granted special access to the private and protected members of another class.

Related by or as if by sisterhood; closely related

(climbing) A spring-loaded camming device.

(Genetics) Of or being one of an identical, related, or homologous pair

(euphemistic) A lover; a boyfriend or girlfriend.

(Architecture) To affix a beam or other structural member to (another) as a supplementary support.

A relative, a relation by blood or marriage.

A daughter of the same parents as another person; a female sibling.

To act as a friend to, to befriend; to be friendly to, to help.

A female member of a religious order; especially one devoted to more active service; (informally) a nun.

(transitive) To add (a person) to a list of friends on a social networking site; to officially designate (someone) as a friend.

Any butterfly in the genus Adelpha, so named for the resemblance of the dark-colored wings to the black habit traditionally worn by nuns.

One who entertains for another such sentiments of esteem, respect, and affection that he seeks his society and welfare; a wellwisher; an intimate associate; sometimes, an attendant.

(British) A senior or supervisory nurse, often in a hospital.

One not inimical or hostile; one not a foe or enemy; also, one of the same nation, party, kin, etc., whose friendly feelings may be assumed. The word is some times used as a term of friendly address.

Any woman or girl with whom a bond is felt through common membership in a community, race, profession, religion, organization, or ism.

One who looks propitiously on a cause, an institution, a project, and the like; a favorer; a promoter; as, a friend to commerce, to poetry, to an institution.

A black woman.

One of a religious sect characterized by disuse of outward rites and an ordained ministry, by simplicity of dress and speech, and esp. by opposition to war and a desire to live at peace with all men. They are popularly called Quakers.

(informal) A form of address to a woman.

A paramour of either sex.

A woman, in certain religious, labour or socialist circles; also as a form of address.

To act as the friend of; to favor; to countenance; to befriend.

(attributively) An entity that has a special or affectionate, non-hierarchical relationship with another.

A person you know well and regard with affection and trust;

(comptheory) A node in a data structure that shares its parent with another node.

An associate who provides assistance;

Something in the same class.

A person with whom you are acquainted;

To strengthen (a supporting beam) by fastening a second beam alongside it.

A person who backs a politician or a team etc.;

To be sister to; to resemble closely.

A member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers)

A female who has the same parents with another person, or who has one of them only. In the latter case, she is more definitely called a half sister. The correlative of brother.

A woman who is closely allied to, or assocciated with, another person, as in the sdame faith, society, order, or community.

One of the same kind, or of the same condition; - generally used adjectively; as, sister fruits.

To be sister to; to resemble closely.

A female person who has the same parents as another person;

(Roman Catholic Church) a title given to a nun (and used as a form of address);

A female person who is a fellow member of a sorority or labor union or other group;

Sometimes used as a term of address for attractive young women