glass-cutter:
(plural: ‘glass-cutters‘; pronunciation: the letter ‘g’ in this word rhymes with the letter ‘g’ in the word “garden”)

a glass-cutter at work
a person who cuts sheets of glass to different sizes;
a person who cuts or grinds designs on glass;
a glazier/glazer (next entry → →),

Master Glass Cutter George Stiverson
A glass-cutter must know how strong the glass sheet he/she is working on because glass is very brittle and the stress on it is not felt as is the case with the other metals but just breaks into pieces.
Glass-cutters find good jobs at glass manufacturing companies, construction companies and gift article making companies.
Glass-cutters use different types of tools, one of which is called a ‘glass-cutter’, a simple pen-like instrument which just makes a score or deep line on the glass which lessens the strength of the glass sheet and breaks along that score, and these days there are high-tech tools and scanners that help the glass-cutters cut the glass with more precision and less wastage.

variety of glass-cutters (tools)
