The Moro Reflex, also known as the startle reflex, is a reflex that is often observed in infants. This reflex causes a sudden and involuntary response to a stimulus, such as a loud noise or sudden movement. There are a few words that are often used as synonyms for the Moro Reflex. These include the startle reflex, which is perhaps the most commonly used synonym, as well as the alarm reflex and the fright reflex. Other synonyms include the sudden movement reflex and the sudden sound reflex. While these terms are all used to describe the same reflex, they may be used in different contexts or situations.