Embolism and Gas embolism

Embolism noun - Occlusion of a blood vessel by an embolus (a loose clot or air bubble or other particle).

Gas embolism and embolism are semantically related. In some cases you can replace phrase "Gas embolism" with "Embolism", this terms are similar.

Gas embolism noun - Obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving.

Embolism and gas embolism are semantically related. You can use "Embolism" instead a noun phrase "Gas embolism".