Can everyone who is said to go to hell in any verse be considered/assumed a Kafir?

I know that Allah sends Kafirs to hell according to many verses. 1) But can everyone who is said to go to hell according to Islam be considered/assumed to be a Kafir? 1) Also, do non-Kafirs go to hell? For example there are many verse saying that idolators are destined for hell. **In some cases some group/category people may be said to be destined for hell and one might not find verses confirming they are kaffirs.** **In the above case, can it be assumed that all people mentioned to be destined for hell in these verses are kaffirs?**