What part of speech is grave?

"Grave" can be a few different parts of speech, depending on its usage:

* Adjective: Describing something serious, important, or dangerous.

* Example: "The situation is grave."

* Noun: A place of burial, especially a marked place in a cemetery.

* Example: "They visited the grave of their ancestors."

* Adverb: Meaning seriously or solemnly.

* Example: "She looked at him gravely."

So, to determine the part of speech, you need to look at the sentence it's used in.