twin

/twɪn/noun

One of two children (or animals) carried in the same womb at the same time and born at the same birth.

Example sentences

“People often mix up the twins because they look so alike.”
“My cousin just had twins, a boy and a girl.”

The standard split is 'identical' versus 'fraternal' twins. Also a modifier meaning matched: 'twin beds', 'twin goals'.

Related words

godfatherA man who agrees at a child's baptism to help guide the child's upbringing, especially in the Christian faith.orphanA child whose parents have died, or (less commonly) who has lost one parent.householdAll the people who live together in one home, considered as a single unit.guardianA person who protects or watches over someone or something.reunionAn organized gathering where people who have been apart, such as family or old classmates, come together again.partnerThe person someone shares a romantic relationship or home life with, such as a spouse.