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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.
Volatility is Usually Standard Deviation, Not Variance. In finance, volatility is usually understood as standard deviation. Of course, variance and standard deviation are very closely related (standard deviation is the square root of variance), but the common interpretation of volatility is standard deviation of returns, and not variance. Here you can find more details: