52 entries under noun topic. ×

16
bottom(turn, back, base, foundation)
12
underneath(base, foundation, side, ground)
11
sole(bottom, lowest part)
8
base(side, bottom, lowest part)
8
undersurface(side, over, bottom)
6
depths(bottom, lowest part)
6
foot(bottom, lowest part)
5
reverse
5
underbelly
4
belly(side, bottom)
4
nadir(bottom, lowest part)
3
bed
3
buttocks
3
foundation(base, ground, bottom, bed)
3
fundament
2
bum
2
butt
2
fanny
2
hindquarters
2
merchantman
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APASmart Define. (2015). underside thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/underside/thesaurus/synonyms
ChicagoSmart Define. 2015. "underside thesaurus" https://smartdefine.org/underside/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, underside thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/underside/thesaurus/synonyms>.
MLASmart Define. "underside thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/underside/thesaurus/synonyms>