I have a challenge, can you distinguish which character set/s belongs to Japanese & Mandarin?
There are of course differences between Kanji / Hanzi but the “difficult” part is knowing which language is which simply by glancing (unless you know either 日本語 or 中文 that is).
In contrast, do you know any words that are near identical when written down between two “alphabetical” languages based on their spelling?
Alphabets are finer grained. Every alphabetic letter is either a consonant or vowel. Sometimes a letter can be one or the other depending on the specific language and context, but nonetheless, consonant or vowel.
Syllabaries pack two or more of these into a single character. Most of the kana are consonant-vowel pairings, with the exception of the six I mentioned previously, and as a result you can end up with a lot more symbols than a pure alphabet would need.
You can also go the other way into abjads, which generally only write consonants. Vowels take the form of optional marks on those consonants. Hebrew and Arabic are the best known examples of these. And you’d be less inaccurate to call those alphabets to be fair.