Police Officer
Policeman
noun
The police (警察) government is full of police officers. This is the formal way to say "police officer." It is similar to 警官, but has a slightly more official feel to it.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あの警察官はいつも余計な一言が多い。
That police officer always says one word too many.
あの警察官、混乱にまぎれてバックレやがったぞ！
That policeman escaped in the confusion!
警察官が容疑者を発見した際、男は丘の上で美しい風景画を描いていました。
When the police officer found the suspect, he was painting a beautiful landscape on a hilltop.