おもしろい [oh-moh-shee-roi] is the standard term for "funny" and also for "interesting." When something is humorous 「おもしろい」 is said. In different areas of Japan, such as Osaka, the word is usually contracted to おもろい [oh-moh-roi] without the し [shi]. You can say something is super funny by saying ちょうおもしろい [choh-oh-moh-shee-roi] which means "very" or "exceptionally" funny. You can also use the Osaka dialect which utilizes めっちゃ [metcha] instead of ちょう [choh] to say "very" or "extremely" in a phrase such as 「めっちゃおもろい」 "metcha-oh-moh-roi" meaning "super funny" or "really hilarious." In short, the main go-to terms for "funny" are "omoshiroi" and "omoroi" in modern parlance.