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Are there words in English with the letter C in which it's really pronounced as Z?
By googling I found an old book which counts these words as in which letter C sounds like Z: suffice, discern, sacrifice. But checking it in Cambridge dictionary raises that it is not true or not updated and those words pronounce as C rather than Z.
Another old book (The Oxford Spelling Book) says:
"C sounds like Z in squinancy which is pronounced like quinzy"
The only examples I can find after searching are proper nouns: The city of Quincy (/ˈkwɪnzi/ KWIN-zee) as mentioned in comments, and the highest mountain in Australia Mount Kosciuszko (/ˌkɒziˈʌskoʊ/).
Standard (i.e. RP or GA) pronunciations of sacrifice and discern now use /s/.
This seems to occur in one pronunciation of the rare (or even archaic) word sice, defined by Merriam Webster as
the number six on a die : a throw of six in dice
MW gives the pronunciation as \ˈsīs, ˈsīz\; the Oxford English Dictionary agrees that it can be pronounced with /z/ in American English (although the OED only lists the pronunciation with final /s/ for British English).
I have never heard this word; I just came across it in the dictionary.
/raɪs/Contrast prize:/praɪz/