What does 怪獣 mean?
怪獣 is a Japanese noun meaning “a giant monster, a kaiju” 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.