What does 怪獣 mean?
怪獣 is a Japanese noun meaning “monster” in English. It is written as 怪獣 in kanji, かいじゅう in hiragana, and kaijuu in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
信じてもらえないだろうけど、茂みの中から怪獣が現れたんだよ。
Believe it or not, a monster emerged from the bush.