Similar words
pois
pois is more formal or literary, "since"; porque is more everyday, "because."
Similar in other languages
German
weil
weil is the German word for the same thing — both mean "because."
Spanish
porque
porque is the Spanish word for the same thing — both mean "because."
Practice
1 What does porque mean?
because
2 Fill the gap: Estudo ___ quero.
Full sentence: Estudo porque quero. (I study because I want to.)
3 Which fingerprint chart matches porque?
porque: neutral register, core frequency, general domain, neutral connotation.