And if that above question was directed at me (about verbs and nouns), usually i know at a glance what the word is and what it means, but the first thing to come to my mind isn’t “verb” or “noun”. It’s more like a subconscious awareness that it is a verb or a noun. I don’t have to tell myself it is, if that makes sense. but to get a full meaning I do have to read the entire sentence. I’m sure though with Japanese it is the same for you, but I read and understand writing in my native language quite quickly. The understanding comes immediately with the reading.