Words so far:
Rapidmon
Rosemon
Rinkmon
Ruki
Raremon
Renamon
Rook Device (TCG card)
Ranamon
RookChessmon Kuro
Ryo
RookChessmon Shiro
Rika
Reppamon
Ravemon
Ravemon Burst Mode
RiseGreymon
Rekisumon XD
Ruchiemon (Romaji of Lucemon)
Rapidmon (Golden Armor)
Ruchiemon SATAN Mode (Romaji of Lucemon Shadow Lord Mode)
Raidramon
Ruchiemon Falldown Mode (Romaji of Lucemon Falldown Mode)
Ruchiemon Larva (Romaji of Lucemon Larva)
RookChessmon White
RookChessmon Black
RhodoKnightmon
RhinoKabuterimon
Regulumon Leo
Ryuudamon
Rosemon Burst Mode
Rhinomon
Rinchei Li (Shiuchon and Jenrya's elder brother)
Rising Destroyer (RiseGreymon's attack)
RedVeggiemon
Rosemon X
Revolmon
Rose Rapier
Reichmon
Rhihimon (Reichmon's dub name)
Reaper - Cable Reaper from TCG
Reapermon
Raidenmon
Raptordramon
Raijinmon
Red V-Dramon
Ryou Akiyama
Rei Saiba
Romeo (TCG)
Real World
Rib Sandwich (TCG)
Reverse Seven (Card)
Rudri Tarpana (TCG)
Raining Thorns (Lillymon's attack)
Reaper Program (TCG)
Rain of Pollen (Floramon attack)
Red Offensive (TCG)
Raramon
Rosa (I think this was one of those world tour kids from 02, not sure)
Romi Paku
Rentarou Satsuma
Royal Slash (One of Imperialdramon Paladin Mode's attacks)
Rosetta Stone (Nefertimon's attack)
Rumi Shishido (Loppmon's Seiyuu)
River of Power (MetalSeadramon's Dub attack)
Russia (Sora and Miyako went to Russia during those World Tour eps in 02)
Rook Gatling (RookChessmon's attack)
Royal Sabre (Dukemon attack)
Rapid Fire (Rapidmon attack)
Royal Knights
Rolling Upper
Relena <-touma's sister
Rapidmon
Rosemon
Rinkmon
Ruki
Raremon
Renamon
Rook Device (TCG card)
Ranamon
RookChessmon Kuro
Ryo
RookChessmon Shiro
Rika
Reppamon
Ravemon
Ravemon Burst Mode
RiseGreymon
Rekisumon XD
Ruchiemon (Romaji of Lucemon)
Rapidmon (Golden Armor)
Ruchiemon SATAN Mode (Romaji of Lucemon Shadow Lord Mode)
Raidramon
Ruchiemon Falldown Mode (Romaji of Lucemon Falldown Mode)
Ruchiemon Larva (Romaji of Lucemon Larva)
RookChessmon White
RookChessmon Black
RhodoKnightmon
RhinoKabuterimon
Regulumon Leo
Ryuudamon
Rosemon Burst Mode
Rhinomon
Rinchei Li (Shiuchon and Jenrya's elder brother)
Rising Destroyer (RiseGreymon's attack)
RedVeggiemon
Rosemon X
Revolmon
Rose Rapier
Reichmon
Rhihimon (Reichmon's dub name)
Reaper - Cable Reaper from TCG
Reapermon
Raidenmon
Raptordramon
Raijinmon
Red V-Dramon
Ryou Akiyama
Rei Saiba
Romeo (TCG)
Real World
Rib Sandwich (TCG)
Reverse Seven (Card)
Rudri Tarpana (TCG)
Raining Thorns (Lillymon's attack)
Reaper Program (TCG)
Rain of Pollen (Floramon attack)
Red Offensive (TCG)
Raramon
Rosa (I think this was one of those world tour kids from 02, not sure)
Romi Paku
Rentarou Satsuma
Royal Slash (One of Imperialdramon Paladin Mode's attacks)
Rosetta Stone (Nefertimon's attack)
Rumi Shishido (Loppmon's Seiyuu)
River of Power (MetalSeadramon's Dub attack)
Russia (Sora and Miyako went to Russia during those World Tour eps in 02)
Rook Gatling (RookChessmon's attack)
Royal Sabre (Dukemon attack)
Rapid Fire (Rapidmon attack)
Royal Knights
Rolling Upper
Relena <-touma's sister