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You could, but it wouldn't be correct. :) "Kuh" is feminine. In the nominative and accusative case, feminine nouns take "eine." E.g. "Eine Kuh hat hier Dreck gemacht" (A cow made a mess here) or "Ich besitze eine Kuh." (I own a cow). Eventually, you'll come across other cases, but none of them use "ein" for feminine nouns. If you come across "ein Kuh" again, please report it as wrong.
For a lot of words there really is no way of knowing. Its more or less random. If you practice a lot you will eventually get the hang of it. You know how "An couch" sounds wrong and "A couch" sounds right, well eventually when you die, das, or der wrong it will sound that same and you will realize it is wrong by the way it sounds with the word.
A long time ago when I was super young, like 12 I got harcore into German and knew a lot of the rules, now about 10 years later, not seeing a single german word again untill I got this app 3 weeks ago stuff just either sounds right or wrong, I'm still learning and get stuff wrong often enough but for the most part the rules went out the window and stuff just started to click in my brain. If you keep practising I promise the same will happen to you eventually and you will "Just know".
There's a soft and hard variant of every vowel, and I don't pretend to be an expert on the pronunciation. However, hard 'u' is pronounced 'oo' like in Kuh. Hard ü can be pronounced by shaping the mouth like you're saying 'oo', but making an 'ee' sound. Kü would sound kinda like someone trying to say 'key' with a mouthful of food.