As in the title: Are グラス and ガラス alternative spellings of the same word?
I'm going through a 2級 prep book for vocabulary and it has
ワイングラス = wine glass
but
ガラスのコップ = glass (for drinking)
and
窓のガラス = window glass
Are グラス and ガラス the same or do I have to be careful when to use which?