御世話になる[osewaninaru] to receive favor (favour)
御話中[ohanashichuu] busy (phone)
零し話[koboshibanashi] complaining
ほそぼそ話す[hosobosohanasu] to speak slowly and quietly
アドオン電話[adoondenwa] add-on telephone

ギリシア神話[girishiashinwa] Greek mythology
コードレス電話[koodoresudenwa] cordless phone
テレビ電話[terebidenwa] visual telephone
哀話[aiwa] sad story
一つ話[hitotsubanashi] anecdote

遠隔講義[enkakukougi] distance learning
休講[kyuukou] lecture cancellation
公開講座[koukaikouza] extension lectures
講演[kouen] lecture
講演会[kouenkai] lecture (esp. special engagement by noted speaker)

講義[kougi] lecture
講座[kouza] academic teaching unit
講師[koushi] lecturer
講習[koushuu] short course
講習会場[koushuukaijou] training center