frontier (n.)

• anteriority
• antipodes
• backwash
• backwater
• backwoods
• boondocks
• border
• borderland
• borderline
• bound
• boundary
• bounds
• bourn
• brush
• bush
• ceiling
• circumscription
• compass
• cutoff
• deadline
• delimitation
• determinant
• determinative
• display
• end
• enigma
• extreme
• extremity
• facade
• face
• facet
• facia
• finish
• floor
• fore
• forefront
• foreground
• forehand
• foreland
• forepart
• forequarter
• foreword
• front
• frontage
• frontal
• frontispiece
• hack
• head
• heading
• hedge
• hinterland
• interface
• lap
• limen
• limit
• limitation
• limiting
• limits
• line
• littoral
• march
• marches
• marchland
• mark
• mete
• mystery
• n
• nowhere
• obverse
• outback
• outpost
• outskirts
• pale
• pole
• preface
• prefix
• priority
• proscenium
• puzzle
• remote
• riddle
• rimming
• start
• term
• terminal
• terminus
• threshold
• wasteland
• wilderness
• woods
• x
• z