I keep a word processed file with keyword blocks I've used. What I generally do, if I have a lot of images that take the same keywords, is write up the keyword list in my file, then just cut and paste for each image. If there is something different in one or two of them, I put that different word at the end of the string after I paste the main list of words in. For example, if you're in a national park, start with the park name, then the specific characteristics of that park like "red rocks" and all the variations thereof, then if there's something different in one photo - like an animal, add the animal name to either the front or the back of the list once you paste it in. That helps me prevent spamming, but I have found a couple where I have, for example, the word "window" in there when it's clearly a "door" in the image....I fix them when I find them. I haven't done that very often.