I have seen “newest” used on stackoverflow.com These are their last wishes According to the online dictionaries i checked, “latest” = “most recent” and “n.
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However newest is a more straightforward and general word
Latest is frequently applied in news, fashion, tech, or other contexts with a lot of change, and so it has a slight connotation that the thing is hot, trendy, or otherwise important to people because of its newness
It can also function as a noun, for example Q&a for speakers of other languages learning english Q&a for speakers of other languages learning englishthis tag is for questions about the meaning of a word, which a dictionary cannot answer Use this tag for questions about the meaning and/or usage of a particular phrase, which a dictionary cannot answer
Learn more… top users synonyms 5,236 questions newest active more filter 0 votes 1 answer Q&a for speakers of other languages learning englishthis tag is for grammar questions, but only if you're not certain what other tag to use If possible, tag as tense, verb, articles, prepositions, or some other more specific tag or tags instead. This tag is for questions which a dictionary cannot answer about the meaning or correctness of a word in a sentence
Give as much context as possible
The difference is in the future of the sentence Last implies nothing else will follow It's the last, and after this it is finished Latest implies that it is the last to date, which means there could be more to follow
The examples in j.r.'s post fit the case They leave their last will and testament They won't be able to leave another will after that
