Davy's gray and Greyness

Davy's gray noun - Slightly purplish or bluish dark grey.

Greyness and Davy's gray are semantically related. In some cases you can use "Greyness" instead a noun phrase "Davy's gray".

Greyness noun - A neutral achromatic color midway between white and black.

Davy's gray and greyness are semantically related. Sometimes you can replace phrase "Davy's gray" with "Greyness", this terms are similar.