There are no conjunctions that start with X in English. Conjunctions are small linking words like “and,” “but,” “because,” and “although,” and none of them begin with this letter. The list is short on every letter, since English has only about 50 common conjunctions, but X is one of the few letters with no entry at all.

The reason is simple. In English, the letter X almost never starts a word. When it does, it usually makes a “z” sound, as in “xylophone” or “xenon,” and these words come from Greek. Most of them name science terms, musical instruments, or chemical elements. Conjunctions are different. They are very old words that grew from Old English and Germanic roots, and those roots have no X-words. New conjunctions are almost never added to a language, so there is no chance that one will appear later.

Some items come close, but none fit. The word “xor” is a logic term used in computer science, and it means “one or the other, but not both.” It works a bit like “or,” yet it is a technical operator, not a true conjunction in a sentence. The Roman numeral “X” and the symbol “x,” which can stand for “times” or “by,” also link two things, but they are symbols, not words. If you are looking for words that join ideas, you will find far more options under letters such as A, B, and W.