I don't think its typical for cats to cry, as in how a human child would cry w/ tears. Sick/hurting cats usually try to hide that they are in a weakened state and are likely to just hide quietly. Personally, and from what I've read, I don't think cats really experience that particular more human emotion that was evolved to evoke group sympathy in a very social empathetic environment, at least not much. I think they're more about fight or flight, excitement, wants (food/toy), curiosity, location announcement, etc. They can definitely have a diverse vocabulary, that's for sure. Buttercup is quiet, but Wesley will trill, chatter, chirp, and meow a bunch of different ways.