Bold
Bold adjective - Inclined or willing to take risks.
Spark plug and bold are semantically related. In some cases you can use "Spark plug" instead an adjective "Bold".
Spark plug
Spark plug noun - Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark.
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Synonyms for Spark plug
Bold and spark plug are semantically related. Sometimes you can use "Bold" instead an adjective phrase "Spark plug".
Mutual synonyms
Cite this Source
Spark plug and Bold. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/bold/spark_plug
Bold & Spark plug. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/bold/spark_plug>.
Spark plug or Bold. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/bold/spark_plug.
Google Ngram Viewer shows how "bold" and "spark plug" have occurred on timeline