Similar words
alfândega
alfândega is more common and standard in Brazilian Portuguese; aduana is used more in some formal contexts — both mean "customs."
Similar in other languages
Spanish
aduana
aduana is the Spanish word for the same thing — both mean "customs."
French
douane
douane is the French word for the same thing — both mean "customs."
Practice
1 What does aduana mean?
customs
2 Fill the gap: Passamos pela ___.
Full sentence: Passamos pela aduana. (We went through customs.)
3 Which fingerprint chart matches aduana?
aduana: neutral register, common frequency, general domain, neutral connotation.