Comparison
noun, verbal noun, の adjective
A compare and contrast will give you a comparison of something.
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.
偽物のダイヤと本物のダイヤを直接比較してみれば、どっちがどっちだかすぐに分かるよ。
If you directly compare a false diamond with a real one, you’ll know which one is which right away.