Accent mark and Grave accent

Accent mark noun - A diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation.

Grave accent and accent mark are semantically related. In some cases you can replace phrase "Grave accent" with "Accent mark", this phrases are similar.

Grave accent noun - A mark (`) placed above a vowel to indicate pronunciation.

Accent mark and grave accent are semantically related. You can use "Accent mark" instead a noun phrase "Grave accent".