Normal spectrum refers to a range of values or conditions that are considered standard or typical. However, there are several synonyms that can be used to describe this type of range. For example, the words "standard" and "average" can be used interchangeably to mean normal spectrum. Other synonyms include "typical," "normal range" and "median." These words can be used to describe everything from a person's height or weight to the range of temperatures found in a certain area. In general, normal spectrum refers to a range of values that are not considered unusual or extreme in any way.