Comment by tuukkah

No, comprehension is again orthogonal to reading as it is needed in spoken language too. Remember: everybody's (unless you have a severe speech or hearing impairment as a baby) first language is a spoken language, and to extend it to a written language you will have to learn (be taught) an artificial orthography to map to and from. You can know a lot of vocabulary before learning to read (if you ever do). In a language with a phonemic writing system, your sets of spoken and written vocabulary are the same, whereas in English they only overlap. In both cases, knowing a word is orthogonal to knowing its meaning(s).