| synthesis gas(expression, idiom, fuel) | |
| synthetic gas(expression, idiom, fuel) | |
| tantalum(noun, element) | |
| technetium(noun, element) | |
| terbium(noun, element) | |
| thallium(noun, element) | |
| thermonuclear bomb | |
| thorium(noun, element) | |
| thulium(noun, element) | |
| tin(noun, element) | |
| titanium(noun, element) | |
| tungsten(noun, element) | |
| underestimate | |
| uranium(noun, element) | |
| vanadium(noun, element) | |
| vapor(noun, gas) | |
| weather balloon | |
| ytterbium(noun, element) | |
| yttrium(noun, element) | |
| zinc(noun, element) |
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| APA | Smart Define. (2015). hydrogen thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/hydrogen/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hydrogen thesaurus" https://smartdefine.org/hydrogen/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, hydrogen thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/hydrogen/thesaurus/synonyms>. |
| MLA | Smart Define. "hydrogen thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/hydrogen/thesaurus/synonyms> |