This is the 3622nd most frequent Japanese word.
防火
Fire prevention.
Here, '防火' (bōka) translates to 'fire prevention,' indicating the actions taken to prevent fires, used in a noun phrase.
その建物は防火対策が万全です。
The building has comprehensive fire prevention measures.
In this sentence, '防火' (bōka) modifies '扉' (tobira), meaning 'door,' to denote it as a fireproof door. The usage is adjectival.
防火扉を閉めてください。
Please close the fireproof door.
Here, '防火' (bōka) combines with '訓練' (kunren), meaning 'training,' to describe a training exercise focused on fire prevention. It connects contextually to the activity.