When did we stop talking about "atomic" energy and "atomic" bombs and start talking about "nuclear" energy and "nuclear" bombs? And why?
If you break it into subtopics you see the data is a bit messier: https://books.google.com/ngrams/graph?content=atomic+bomb%2Cnuclear+bomb%2Cnuclear+weapon%2Cthermonuclear%2Cnuclear+power%2Catomic+energy%2Cnuclear+energy&year_start=1945&year_end=2008&corpus=0&smoothing=3&share=&direct_url=t1%3B%2Catomic%20bomb%3B%2Cc0%3B.t1%3B%2Cnuclear%20bomb%3B%2Cc0%3B.t1%3B%2Cnuclear%20weapon%3B%2Cc0%3B.t1%3B%2Cthermonuclear%3B%2Cc0%3B.t1%3B%2Cnuclear%20power%3B%2Cc0%3B.t1%3B%2Catomic%20energy%3B%2Cc0%3B.t1%3B%2Cnuclear%20energy%3B%2Cc0 …