To be honest, I sometimes reuse one letter on purpose when I can't think of a word which would fit without reusing a single wrong letter. This way I can check if other letters which weren't used before are in the word or not. That said, of course there are words (like today) which have the same letter twice so that might throw you off. You think of words with the letters you didn't use but you should think of words with an additional letter which has been used and is already in the correct spot.
Welp, the first I found out was a lucky guess at the first try, afterwards at the second one I had such a streak of bad luck (seriously, four different words with 80% of the letters in the same places?) that I didn't have enough tries left for the last one... The third one (in the upper left) was relatively trivial once I had the first two since I did have all the letters, I knew two correct letters and the other ones were correct, just in the wrong places.