| enthusiastic(adjective, energetic, daring, resourceful, innovative) | |
| enzyme(noun, spur, goad, incentive, impetus) | |
| fireball | |
| firer | |
| gadfly | |
| galvanizer | |
| generator | |
| go-ahead(adjective, energetic, daring, resourceful, innovative) | |
| go-getter(noun, rock, whip, pillar, presence) | |
| go-go(adjective, energetic, daring, resourceful, innovative) | |
| goad(noun, drug, spur, incentive, upper) | |
| gumptious(adjective, energetic, daring, resourceful, innovative) | |
| hard ball(expression, adjective, energetic, daring, resourceful) | |
| hardworking(adjective, energetic, daring, resourceful, innovative) | |
| heavy hitter(expression, whip, presence, player) | |
| heavyweight(whip, presence, player) | |
| hot shot | |
| hungry(adjective, energetic, daring, resourceful, innovative) | |
| hustling(adjective, energetic, daring, resourceful, innovative) | |
| ignition system(noun, device) |
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| APA | Smart Define. (2015). spark plug thesaurus. Retrieved September 22, 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 22, 2026). |
| Harvard | Smart Define 2015, spark plug thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/spark_plug/thesaurus/synonyms>. |
| MLA | Smart Define. "spark plug thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/spark_plug/thesaurus/synonyms> |