Water vapour is steam, i.e. it is the gaseous phase of water mixed with other gases (N2, O2, etc). Just like liquid water is still water if you mix it with alco

Water vapour is steam, i.e. it is the gaseous phase of water mixed with other gases (N2, O2, etc). Just like liquid water is still water if you mix it with alcohol. There is no possibility for a phase transition.