Close-grained and Nonporous

Close-grained adjective - Dense or compact in structure or texture, as a wood composed of small-diameter cells.

Nonporous and close-grained are semantically related in firm topic. In some cases you can use "Nonporous" instead an adjective phrase "Close-grained", when it comes to topics like inflexible.

Nonporous adjective - Not porous; especially not having vessels that appear as pores.

Close-grained and nonporous are semantically related in firm topic. Sometimes you can use "Close-grained" instead an adjective "Nonporous", if it concerns topics such as inflexible.