Rainbow
Rainbow noun - An arc of colored light in the sky caused by refraction of the sun's rays by rain.
Spectrum
Spectrum noun - The distance or extent between possible extremes.
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Synonyms for Spectrum
Rainbow and spectrum are semantically related in color spectrum topic. You can use "Rainbow" instead a noun "Spectrum".
Mutual synonyms
Both words in one sentence
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It's a quick way to convey the idea of 'rainbow' without using the whole spectrum.
Source: Rainbow Lite - The "seven colours of the rainbow" as we know them derive from Isaac Newton's experiments in optics in the 1670s, where he first observed the spectrum of sunlight split by a prism.
Source: Newer Than They Think -
You Gotta Have Blue Hair: You can have a hair color from the entire spectrum—even transparent or rainbow!
Source: Tabletop Game / Maid RPG
Cite this Source
Spectrum and Rainbow. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/rainbow/spectrum
Rainbow & Spectrum. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/rainbow/spectrum>.
Spectrum or Rainbow. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/rainbow/spectrum.
Google Ngram Viewer shows how "rainbow" and "spectrum" have occurred on timeline