Lashing out is a common phrase used when someone expresses their anger or frustration in a negative way. However, there are different words that are synonymous to this phrase such as raging, venting, exploding, or outburst. These words imply the same forceful, angry expression that someone may experience during a time of stress or turmoil. Other similar terms can include tantrum, tirade, rampage, or even erupting. However, it's crucial to understand that while these words do express anger and frustration, it is important to manage our emotions in a healthy way rather than resorting to lashing out or other destructive reactions.