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One of the most difficult things to master in a foreign language: cases where the target language uses multiple words (subcategories) for a concept for which your previous languages only have one word. You're simply not used to parse reality into these new subcategories.
A simple example would be counters in Japanese. In European languages, a counter is just a number, so you would say, "three birds, three peanuts, three sheets of paper, three pens, three cars". In Japanese, a counter conveys not just quantity but also various object properties
So you would say, sanba (birds and bunnies), sanko (generic small thing), sanmai (flat thing), sanbon (cylindrical thing), sandai (large vehicle), etc. In fact there are more distinct counters than I can count. It takes a long time to get used to these distinctions
There's even a counter specifically for chopsticks. Even though they're cylindrical objects, chopsticks are their own semantic category within cylinder-like things
Also birds and bunnies are a distinct category within animals, so while there's an animal counter, birds and bunnies have their own specific counter. Bunnies are a type of bird 
Thai does that too.
As do Mandarin Chinese!
Greek doesn't have words for hand or foot. The common everyday words mean any part of the arm/hand or leg/foot.
This fails even 1NF
Yes, but the generic still gets you by. I asked a sushi chef for ‘nikan’ (2 pieces of sushi) thinking I was being correct and he confirmed with me in the generic: ‘futatsu?’
It’s the same concept in Mandarin Chinese to use measure words. The trick is to just not think about it, but to learn the measure word as part of the word. Same as you’d learn a word is “male”, “female” or “neutral” in German
Context in general is super important for Manadarin. I always thought that with so many words just sounding the same, you’d be lost without it, and measure words help a lot as they add context
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