Old French fust

← Old French estre (mention)

← Old French fu (link)

← Old French fut (link)

← Old French fud (link)

← Latin fustis (inherited)

→ English fusty (mention)

→ English foist (derived)

→ English fust (borrowed)

→ English fuster (mention)

→ Scots foosty (derived)

→ Scots foost (derived)