Thai ประตู

← Lao ປະຕູ (cognate)

← Malay pintu (borrowed)

← Northern Thai ᨲᩪ (cognate)

← Northern Thai ᨸᨲᩪ (mention)

← Bouyei dul (cognate)

← Shan တူ (cognate)

← Southern Thai ตู (cognate)

← Proto-Tai *tuːᴬ (inherited)

← Thai ปาก (compound)

← Thai ตู (compound)

← Zhuang dou (cognate)

← Zhuang du (mention)

→ Lao ປະຕູ (cognate)

→ Southern Thai ตู (mention)

→ Thai ประตูน้ำ (compound)

→ Zhuang dou (cognate)