Grendel and Ymir

Ymir and Grendel are semantically related. In some cases you can replace term "Ymir" with "Grendel", this words are similar.

Ymir noun - (Norse mythology) the primeval giant slain by Odin and his brothers and from whose body they created the world: the sea from his blood; the earth from his flesh; the mountains from his bones; the sky from his skull.

Grendel and Ymir are semantically related. Sometimes you can replace term "Grendel" with "Ymir", this nouns are similar.