We don't have synonyms for thowt yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tho't, thot and thort.
(n) :
Archaic spelling of thought. [(countable) A representation created in the mind without the use of one's faculties of vision, sound, smell, touch, or taste; an instance of thinking.]
(n) :
Archaic spelling of thought. [(countable) A representation created in the mind without the use of one's faculties of vision, sound, smell, touch, or taste; an instance of thinking.]