3 entries under levity topic. ×
| helium balloon(expression, idiom) | |
| hot air balloon(expression, idiom) | |
| lighter-than-air balloon(expression, idiom) |
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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> |