A small wood, thicket, or copse, possibly one that shelters game.
Etymology: from Latin spina, thorn
There are many words for a small area of mostly trees or shrubs: thicket, spinney, copse, coppice, brake....
Perhaps they all had distinct meanings back when the proper management of wooded areas was as crucial as the proper management of a garden or root cellar, but the modern definitions seem looser.
It seems that a spinney is a copse (small woodland) that shelters game, and a coppice is an area where the shrubs are cut for use. A brake might be a clump of brush, briars, or broken trees, and a thicket might be a denser version of that. A grove is a group of trees without undergrowth, or an orchard or stand of fruit-bearing trees.
My yard has many thickets, formed by neglect and disguised as "wildlife habitats", and many man-made brakes formed by dumping branches onto thickets. I might be able to call the front lot line a spinney: brush piles hidden between tangled rows of fruiting shrubs and small trees; it should be an excellent shelter for game. I'd like to have a coppice someday, but that implies sufficient time to use what I've cut.