Another word for a fastener is a snap. A collar fastener is a
fastener or snap that is used on a collar.
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A snap fastener is a fastener used on clothing. Usually this
type of fastener makes a 'snap' noise when it is fastened. Another
word for 'snap fastener' would be 'press stud'.
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That is a snap.
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The homophone for a metal fastener is "bolt" and for a sound made with fingers is "snap."