Similar words
niña
muchacha specifically means a young woman or teenage girl; niña specifically means a young child, a little girl — a different age range.
Similar in other languages
Portuguese
garota
garota is the Portuguese word for the same thing — both mean "girl."
Portuguese
menina
menina is the Portuguese word for the same thing — both mean "girl."
Practice
1 What does muchacha mean?
girl
2 Fill the gap: La ___ sonrió.
Full sentence: La muchacha sonrió. (The girl smiled.)
3 Which fingerprint chart matches muchacha?
muchacha: neutral register, core frequency, general domain, neutral connotation.