1) Brush 2) Brushwood 3) Coppice 4) Copse 5) Impeding sylvan mass 6) Shrubs and vines in a forest 7) Thicket 8) Undergrowth 9) Underwood 1) Undergrowth 2) Underwood 
• (n.) Shrubs, small trees, and the like, in a wood or forest, growing beneath large trees; undergrowth.
[n] - the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest
undergrowth noun the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest
shrubs, saplings, low vines, etc., growing under the large trees in a wood or forest.