We don't have synonyms for stemm yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are steam, stem and stems.
(n) :
Abbreviation of science, technology, engineering, mathematics, and medicine. [(countable) A particular discipline or branch of knowledge that is natural, measurable or consisting of systematic principles rather than intuition or technical skill.]
(n) :
Abbreviation of science, technology, engineering, mathematics, and medicine. [(countable) A particular discipline or branch of knowledge that is natural, measurable or consisting of systematic principles rather than intuition or technical skill.]