Babel-17 by Samuel R. Delaney
This book impressed me much more than The Einstein Intersection, greatly because it is more "readable" and I understand the story. It explores the Sapir–Whorf hypothesis that language influences thought and perception. Even though this idea has been greatly discredited, it is still an interesting concept. The movie Arrival is a very different story based on the same hypothesis, and I must admit enjoying it more. Another good book involving language used as a weapon is Snow Crash by Neil Stephenson.
I have now read Nova, The Einstein Intersection, and Babel-17. I think I am finished reading this author. His writing tends to feel poetic, and themes and ideas interest me enough that I worked through 3 of his books. But he seems someone who is a great intellectual and well read in literature, yet isn't able to make his works accessible to average people. I often re-read passages or look up concepts while reading Delaney's books, making reading tedious. He is like the James Joyce of sci-fi, and I start thinking I'm just reading his works to try to feel smart.