We don't have synonyms for short answer yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are short-answer.
(n) :
(education, chiefly attributive) A type of question or prompt, especially found in school quizzes and tests, which usually requires the student to write in sentences, as opposed to multiple-choice, fill in the blank, or other question types which require less writing.
(n) :
(education, chiefly attributive) A type of question or prompt, especially found in school quizzes and tests, which usually requires the student to write in sentences, as opposed to multiple-choice, fill in the blank, or other question types which require less writing.