Similar words
petisco
lanche is more of a light meal or snack, like an afternoon snack; petisco is more of an appetizer or nibble, bar-snack style.
Similar in other languages
Spanish
tentempié
tentempié is the Spanish word for the same thing — both mean "snack."
Practice
1 What does lanche mean?
snack
2 Fill the gap: Faço um ___ à tarde.
Full sentence: Faço um lanche à tarde. (I have a snack in the afternoon.)
3 Which fingerprint chart matches lanche?
lanche: neutral register, core frequency, general domain, neutral connotation.