The problem with questions like this is that the second bit of the question is always missing, making it impossible to answer. You're not telling us what they are more dangerous than - goldfish, bags of sand, old plastic bags? What?
This depends on the material of the carboy.
because carboys is made up of glass
because some chemicals contain really powerful acids which can burn and melt things like plastic
In thick glass carboys
Glass or plastic carboys can both be purchased from a variety of online retailers. Typically, one would purchase these from brewing supply shops, such as Label Peelers or MoreBeer, but one could also obtain them from Amazon.
Since this is posted in "Beer and Brewing" I can only assume you mean, the large glass jugs used by homebrewers to ferment beer. Those are called carboys.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern --RB-Y-. That is, seven letter words with 3rd letter R and 4th letter B and 6th letter Y. In alphabetical order, they are: carboys kerbaya tarboys
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 6 words with the pattern -A--OY-. That is, seven letter words with 2nd letter A and 5th letter O and 6th letter Y. In alphabetical order, they are: batboys carboys dayboys lamboys tannoys tarboys
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 6 words with the pattern CA---Y-. That is, seven letter words with 1st letter C and 2nd letter A and 6th letter Y. In alphabetical order, they are: cacodyl caconym carboys carneys carseys causeys
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern CAR--Y-. That is, seven letter words with 1st letter C and 2nd letter A and 3rd letter R and 6th letter Y. In alphabetical order, they are: carboys carneys carseys
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern C-RBO--. That is, seven letter words with 1st letter C and 3rd letter R and 4th letter B and 5th letter O. In alphabetical order, they are: carbons carbora carboys
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern --RB-YS. That is, seven letter words with 3rd letter R and 4th letter B and 6th letter Y and 7th letter S. In alphabetical order, they are: carboys tarboys