The ones I know and have used are.
ciao.... (Italian)- goodbye
caveat emptor... (Latin)- 'let the buyer beware'
consommé..... (French)- a clear meat or chicken soup
coup d'état.... (French)- overthrowing of a government. Usually with violence
déjà vu..... (French)- a feeling of repetition of something or a moment in the past
et cetera..... (Latin)- and so on and so forth ( but spell it ect.)
mi casa es su casa..... (Spanish) – this is extremely universal no translation required.
gringo.....
paella....I had to look that up after an episode of Seinfeld
par excellence..... (French)- 'above all' (por excelencia in Spanish)
per capita..... (Latin)- per person
per se.... (Latin) –essentially
picante..... (Spanish) –hot, highly spiced
pro bono...... (Latin)- for the good of the public
I have to look at part one now.