Giant Monster
Kaiju
noun
Look at that suspicious beast... it's Godzilla, walking around looking suspicious. What is Godzilla? He is a giant monster.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
スーパーマンは、怪獣に数分遅れて現れた。
Superman turned up a few minutes later than the giant monster.
ワニカニって怪獣なの？
Is WaniKani a kaiju?
怪獣が私の白いスカートにどろをはねかけた。
The kaiju splashed mud on my white skirt.