Defect
Fault
noun
This item is lacking a piece, causing its surface to cave in. What a defect!
欠陥 is a relatively formal word that refers to a fault in something, whether in a physical object, a system, or even a plan.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
消費者からこの商品の安全性の欠陥が指摘されています。
The safety defect in this product was identified by consumers.