- sorghum15
- spectrum18
- speculum20
- spermagonium25
- spermatium20
- spermatogonium27
- sphagnum20
- spiculum20
- spirillum18
- splenium17
- sporangium20
- sporogonium21
- sputum14
- stadium12
- staminodium20
- stannum13
- sternum12
- stewbum17
- stibium14
- stickum18
- stomodaeum18
- stomodeum17
- stramonium18
- stratum11
- strontium14
- strum9
- stum8
- stumblebum25
- stylopodium22
- subgum16
- suboptimum24
- subphylum25
- substratum18
- succedaneum24
- sudarium14
- sudatorium16
- sugarplum20
- sulfonium19
- sum7
- superpremium26
- superstratum20
- swum11
- syconium18
- sympodium22
- symposium21
- syncytium21
- talcum14
- tantalum14
- tantrum12
- tapetum14
- technetium20
- tectum13
- tedium11
- teetotum12
- tegmentum19
- telium11
- tellurium16
- tenaculum19
- terbium14
- tergum12
- termitarium18
- terrarium13
- tetotum11
- tetrazolium25
- thallium16
- thorium13
- thrum11
- thulium15
- timpanum19
- titanium13
- tomentum16
- transuranium19
- trapezium25
- triclinium19
- triduum13
- triennium15
- trifolium17
- triforium16
- trillium14
- triticum15
- tritium11
- trivium15
- tympanum21
- ultimatum18
- ultravacuum25
- um6
- unguentum19
- unnilhexium28
- unnilpentium24
- unnilquadium31
- uranium13
- uredinium16
- uredium13
- uropygium21
- vacuum18
- vanadium18
- variorum16
- vasculum21
- velarium17
- vellum16
- velum14
- veratrum16
- vestigium19
- vexillum25
- viaticum19
- viburnum21
- vinculum22
- vivarium20
- wampum19
- xiphisternum29
- ytterbium18
- yttrium13
- yum9
- zirconium26
- zoarium20
- zoecium23
- zooecium24
- zoosporangium32