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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?
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2014-11-15T08:58:07.557
19521
2014-11-15T10:26:23.160
2014-11-15T10:26:23.160
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question
word-choice spelling
Are グラス and ガラス alternative spellings of the same word?
While people will likely understand you if you mix them up, it's better to use
proper one:

`ガラス` = glass (material)

  * 吹きガラス (glass blowing) 
  * ガラスの皿 (glass plate)

`グラス` = a glass (for drinking)

  * タンブラーグラス (tumbler glass)
  * ワイングラス (wine glass), グラスワイン ([drink] a glass of wine)
  * カクテルグラス (cocktail glass)
  * ミキシンググラス (mixing glass)

`~グラス` = some other things made from glass, or have "glass" in the English
name:

  * サングラス (sunglasses), オペラグラス (opera glasses) 
  * ステンドグラス (stained glass)
  * アワーグラス (hourglass)
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2014-11-15T09:49:25.283
19522
2014-11-15T09:49:25.283
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answer