density (part of speech: noun)
thickness (part of speech: noun)
- For these reasons, then, I was several hours in cutting across a piece of nine- inch deal of only an inch in thickness; but I got through at last, and then, placing myself once more on my back, and setting my heels to the plank, I had the satisfaction to feel it yielding. - "The Boy Tar", Mayne Reid.
- Suddenly out of the thickness ahead loomed up a great black British freighter making for St. Petersburg, as the Prince supposed. - "A Rock in the Baltic", Robert Barr.
- He had to pause a minute, owing to a thickness in his throat. - "The Privet Hedge", J. E. Buckrose.