| radical stimulus(noun, expression, spur, goad, incentive) | |
| reactant(noun, spur, goad, incentive, impetus) | |
| reactionary(noun, spur, goad, incentive, impetus) | |
| ready(adjective, energetic, daring, resourceful, innovative) | |
| relay | |
| resourceful(adjective, energetic, daring, innovative, ingenious) | |
| self-starter | |
| self-starting(adjective, energetic, daring, resourceful, innovative) | |
| sharpy | |
| snappy(adjective, energetic, daring, resourceful, innovative) | |
| spanking(adjective, energetic, daring, resourceful, innovative) | |
| sparkplug | |
| spirited(adjective, energetic, daring, resourceful, innovative) | |
| spur(noun, drug, goad, incentive, upper) | |
| stimulator | |
| stirring(adjective, energetic, daring, resourceful, innovative) | |
| synergist(noun, spur, goad, incentive, impetus) | |
| take-over(adjective, energetic, daring, resourceful, innovative) | |
| tempter | |
| trailblazer(whip, presence, player) |
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| APA | Smart Define. (2015). spark plug thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/spark_plug/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "spark plug thesaurus" https://smartdefine.org/spark_plug/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, spark plug thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/spark_plug/thesaurus/synonyms>. |
| MLA | Smart Define. "spark plug thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/spark_plug/thesaurus/synonyms> |