介添え[kaizoe] helper
寄添う[yorisou] to get close
後添い[nochizoi] one's second wife
食品添加物[shokuhintenkabutsu] food additive
申し添える[moushisoeru] to add to what has been said

添う[sou] to meet (one's expectations, etc.)
添加[tenka] addition
添加剤[tenkazai] addition agent
添加物[tenkabutsu] addition
添削[tensaku] correction

完遂[kansui] to accomplish
やり遂げる[yaritogeru] to accomplish
殺人未遂[satsujinmisui] attempted murder
自殺未遂[jisatsumisui] attempted suicide
遂げる[togeru] to accomplish

遂に[tsuini] finally
遂行[suikou] accomplishment
為し遂げる[nashitogeru] to accomplish
未遂[misui] attempt (e.g. at crime)
未遂罪[misuizai] attempted crime