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One way to measure a bond's volatility is to track its spread against another bond. Basically, you will need to compare the bond's performance over time to a relatively stable bond. The most stable bonds are US Government Bonds. Start with a federal bond and track interest rate over a time period of 1 to 5 years.
Variance is a measure of distribution of returns and is not neccesarily bound by any time period. Volatility is a measure of the standard deviation (square root of the variance) over a certain time interval. In finance, variance and volatility both gives you a sense of an asset's risk. If the mean is the average return of an asset, variance and volatility can give you a sense of how much that asset either overperforms or under performs.