Synonyms of 'spectrum'
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An assortment is a group of similar things that are of different sizes or colours or have different qualities.
an assortment of cheeses
The gamut of something is the complete range of things of that kind, or a wide variety of things of that kind.
I went through the whole gamut of emotions.
Thesaurus for spectrum from the Collins English Thesaurus
The spectrum is the range of different colours which is produced when light passes through a glass prism or through a drop of water. A rainbow shows the colours in the spectrum.