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Yes, they are written with the Latin alphabet, but they are used in the Japanese language, so I am not sure. I mean, they have entries in Japanese dictionaries and a Japanese reading. What are they?
If they do count as Japanese words, does it mean the Latin alphabet is part of the Japanese language?
There are well-established initialisms and acronyms of Japanese origin. For example:
If these aren't Japanese, what are they? I guess the Latin alphabets, or more precisely, the 26 modern English alphabets, are already part of the Japanese language nowadays.
As for CD and DNA, they are 外来語 (loanwords) and, as such, are Japanese words, just as samurai, kanji, manga, and tsunami are English words.
Other terms common in Japan that use alphabets:
samuraiin the English dictionary, because, despite being derived from Japanese, it's used in English language works.