Root words of 9 letters or fewer with two valid spellings that differ only by PH versus F
50 words
KAPH KAF ALEPH ALEF BUMPH BUMF KHAPH KHAF CALIPH CALIF GONOPH GONOF KALIPH KALIF SULPHA SULFA PHANTOM FANTOM SHOPHAR SHOFAR SULPHID SULFID SULPHUR SULFUR TELPHER TELFER PHANTASM FANTASM PHANTAST FANTAST PHANTASY FANTASY PHILIBEG FILIBEG SULPHATE SULFATE SULPHIDE SULFIDE SULPHITE SULFITE SULPHONE SULFONE SULPHURY SULFURY CALIPHATE CALIFATE SULPHONIC SULFONIC SULPHURIC SULFURIC
Copyright © 2026 Mitch Bayersdorfer · AGPL-3.0 · Thanks to Joe Petree for his definitions for these lists. · Detailed Attributions