Old English fūl

→ English foul (inherited)

→ English foumart (inherited)

→ Old English fulnes (suffix)

→ Old English fylþu (suffix)

→ Greek πύον (cognate)

→ Latin pus (cognate)

→ Latin puter (cognate)

→ Latin putreo (cognate)

→ Old Norse fúll (cognate)

→ Sanskrit पूयति (cognate)

→ Sanskrit पूय (cognate)