Similar words
ajuntar
ajuntar is more colloquial or casual; reunir is more formal or standard, like gathering people for a meeting — both mean "to gather."
Similar in other languages
Spanish
congregar
congregar is the Spanish word for the same thing — both mean "to gather."
Spanish
recabar
recabar is the Spanish word for the same thing — both mean "to gather."
Practice
1 What does reunir mean?
to gather
2 Fill the gap: Vamos ___ a família.
Full sentence: Vamos reunir a família. (Let's gather the family.)
3 Which fingerprint chart matches reunir?
reunir: neutral register, common frequency, general domain, neutral connotation.