Is it possible in Word to create one's own dictionaries? I've got a list of words Word classifies as incorrect and for me they are 100% correct and I'd like to add them to dictionary all in one go.
Yup, you can create your own dictionary. Go to 'File' > 'Options' > 'Proofing'. Once there, choose 'Custom dictionaries' and then click on 'New', finally, add new words to your dictionary.