Answer: TWIN

AnswerCrossword Clue
TWINJacob, to Esau
TWINRomulus, e.g.
TWIN2009 A.L. MVP Joe Mauer, e.g.
TWINBed in old sitcoms
TWINMattress size
TWINSleeper's choice
TWINBaseballer named for two cities
TWINBed with a mate
TWINAbby, to Ann
TWINRomulus, to Remus
TWINMary Kate Olsen or Ashley Olsen
TWIN.. Cities
TWINMatt Damon to Greg Kinnear, in "Stuck on You"
TWINAnn, to Abby
TWINMary-Kate or Ashley
TWINDoublemint commercial actor, e.g.
TWINJenna, to Barbara
TWINDouble
TWINOne of two of a kind
TWINOne of two identical people
twinto bring together in close association
TWINDoppelganger
TWINDuplicate
TWINMinnesota ballplayer
TWINPerson who shares your birthday, absent some exceptionally rare timing
TWINScarlett Johansson or Vin Diesel (who knew?)
TWINExact duplicate
TWINWomb mate
TWINMatching
TWINClone
TWINCastor, to Pollux
TWINChang or Eng
TWINMirror image
TWINMary-Kate or Ashley Olsen, e.g.
TWINSpitting image
TWINBed mate?
TWINIdentical
TWINMatch
TWINWomb-mate
TWINMetrodome player