Crossword puzzles flex one very specific piece of cognition--the ability to find words, which is also known as fluency. Fluency is a type of process based in the speech and language centers of the brain. So doing crosswords might help you get better at word finding, but that's the sum total of their positive benefits to your brain.
misnomer. n. 1. an incorrect or unsuitable name or term for a person or thing. 2. the act of referring to a person by the wrong name.
Meaning: Neglecting to do something; leaving out or passing over something. Classified under: Nouns denoting cognitive processes and contents. Hypernyms (omission is a kind of...): disregard; neglect (lack of attention and due care) Hyponyms (each of the following is a kind of omission):