| impeller | |
| impulse(noun, drug, spur, goad, incentive) | |
| incendiary(noun, spur, goad, incentive, impetus) | |
| incitation(noun, drug, spur, goad, incentive) | |
| incitement(noun, drug, spur, goad, incentive) | |
| inducer | |
| industrious(adjective, energetic, daring, resourceful, innovative) | |
| industrious person | |
| inspirer | |
| intrepid(adjective, energetic, daring, resourceful, innovative) | |
| itching(adjective, energetic, daring, resourceful, innovative) | |
| keen(adjective, energetic, daring, resourceful, innovative) | |
| life | |
| lightning rod(expression, whip, presence, player) | |
| live wire | |
| lively(adjective, energetic, daring, resourceful, innovative) | |
| lusting(adjective, energetic, daring, resourceful, innovative) | |
| man of influence(expression, idiom, whip, presence, player) | |
| motivating force | |
| motivation(noun, drug, spur, goad, incentive) |
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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> |