The word "father" or a variation of it, in many languages (see below).
The Spanish word for potato (in some dialects) and slang for "food".
(in uppercase and with the definite article) the Spanish and Italian word for Pope. Also used occasionally by some Catholics regardless of language.
A lot of languages (often unrelated) have words with labial consonants and open vowels as their word for "father" and "mother"; /papa/ is just one example. A discussion of this phenomenon can be found in the article Mama and papa.