Similar words
muchacha
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 niña mean?
girl
2 Fill the gap: La ___ dibuja un gato.
Full sentence: La niña dibuja un gato. (The girl draws a cat.)
3 Which fingerprint chart matches niña?
niña: neutral register, core frequency, general domain, neutral connotation.