Answer: foe

AnswerCrossword Clue
FOEThem, often
FOEOne who is against you
FOEOne to beat
FOECounter person?
FOEOne who isn't behind you
FOESentry's word
FOEHardly a follower
FOEOne of them?
FOEOther side
FOEGrant, to Lee
FOEHatfield, to a McCoy
FOEOne opposed
FOEOne who isn't with us
FOEUnfriend?
FOEBurr, to Hamilton
FOECompetitor
FOEMilitary enemy
FOEOne on the other side
FOEFriend's alternative
FOEGrendel, to Beowulf
foeenemy
FOESabretooth to Wolverine, e.g.
FOEHostile force
FOEWord in a sentry's question
FOERival
FOEFrenemy, e.g.
FOENo proponent
FOEGoldfinger, to Bond
FOEMcCoy, to Hatfield
FOENemesis
FOEOpposing team
FOEAdversary
FOEFriend's opposite
FOEHector, to Achilles
FOEMoriarty, to Holmes
FOEEnemy
FOEParis, to Romeo
FOEOne not to trust
FOEAntagonist
FOECassius, to Caesar