Bock beer and Lager

Bock beer noun - A very strong lager traditionally brewed in the fall and aged through the winter for consumption in the spring.

Lager and bock beer are semantically related. In some cases you can use "Lager" instead a noun phrase "Bock beer".

Lager noun - A general term for beer made with bottom fermenting yeast (usually by decoction mashing); originally it was brewed in March or April and matured until September.

Bock beer and lager are semantically related. Sometimes you can replace phrase "Bock beer" with "Lager", this terms are similar.