異説[isetsu] different opinion
一説[issetsu] one theory (opinion)
演説[enzetsu] speech
臆説[okusetsu] hypothesis
解説[kaisetsu] explanation

解説者[kaisetsusha] commentator
概説[gaisetsu] general statement
学説[gakusetsu] theory
勧説[kanzei] urging
甘い小説[amaishousetsu] sentimental novel

謬る[ayamaru] to make a mistake
誤謬[gobyuu] fallacy
謬見[byuuken] fallacy
謬説[byuusetsu] fallacy
謬論[byuuron] fallacy

不謬性[fubyuusei] papal infallibility
謬伝[byuuden] false report (rumor, rumour)
帰謬法[kibyuuhou] reductio ad absurdum
合成の誤謬[gouseinogobyuu] fallacy of composition