"It costs thousands of crowns."
Translation:Det kostar tusentals kronor.
You mean about the meaning of these words? I'm not a native speaker but 'tusan' is thousand in English, 'tusentals' in the other hand is thousands (of). 'Jag har tusentals böcker' = I have thousands of books. I have no idea if 'tusantal' is even a word. Could someone please come and explain?