Similar words
barriga
vientre is more anatomical or formal for "belly, abdomen"; barriga is the everyday, colloquial word.
Similar in other languages
English
abdomen
Close — the belly relates to the abdomen.
English
stomach
Close — a belly relates to a stomach.
Practice
1 What does vientre mean?
belly
2 Fill the gap: Le duele el ___.
Full sentence: Le duele el vientre. (His stomach hurts.)
3 Which fingerprint chart matches vientre?
vientre: neutral register, common frequency, general domain, neutral connotation.