You said "login" is a noun (correct) but your example ("login screen") shows it being used as an adjective. The single word can be either an adjective or noun, but your answer is inconsistent.
A person who perform login to site. This person: "was login" to site "logined" to site Which version is correct?
Many players have had their Throne and Liberty session halted by the profile login required error that has been popping up recently. In fact, it can freeze your game ...
Facebook profiles have become the de-facto identities of people across the internet. This is thanks, in large part, to Login With Facebook, the social network's universal login API, which allows users ...