This is the 239th most frequent Japanese word.
消防
"消防" means "firefighting" or "fire prevention."
消防 refers to firefighting, and in this sentence, it is part of the term 消防士 (firefighter).
消防士が火事を消しました。
The firefighters extinguished the fire.
消防 is used as an adjectival modifier for equipment, implying equipment related to firefighting.
消防設備の点検が必要です。
Inspection of the firefighting equipment is necessary.
消防 is used here to refer to the concept and activities related to firefighting.