Bond certificate and Government bond

Bond certificate noun - A certificate of debt (usually interest-bearing or discounted) that is issued by a government or corporation in order to raise money; the issuer is required to pay a fixed sum annually until maturity and then a fixed sum to repay the principal.

Government bond and bond certificate are semantically related. In some cases you can replace phrase "Government bond" with "Bond certificate", this phrases are similar.

Government bond noun - A bond that is an IOU of the United States Treasury; considered the safest security in the investment world.

Bond certificate and government bond are semantically related. You can use "Bond certificate" instead a noun phrase "Government bond".