Heat
Heat noun - Depth of feeling.
Sparks
Both words in one sentence
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Diethyl ether is highly combustible even at relatively low temperatures and therefore dangerous around any kind of heat source, even without open flame or sparks.
Source: Instant Sedation - The flames heat up their oversized kernels until they pop, sending the cobs streaking in all directions; the "rocket" analogy is taken even further when the ones that fly upwards explode into colorful sparks, like fireworks.
Source: Gas Cylinder Rocket
Cite this Source
Sparks and Heat. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/heat/sparks
Heat & Sparks. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/heat/sparks>.
Sparks or Heat. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/heat/sparks.
Google Ngram Viewer shows how "heat" and "sparks" have occurred on timeline