One way to hold this word: it is simply pine plus wood, and the interesting part is that English wood already means two things — the material you build with, and a patch of trees you can walk into. Pinewood inherits both. Say pinewood with nothing in front of it and you are talking about pale, soft timber. Say a pinewood or the pinewoods and you are standing among trees. The small words do the choosing, and the same word then gets borrowed as a place name.
From the word’s history
Wiktionary gives the origin as pine + wood, a plain compound. Because the second part, wood, carries both the material sense and the small-forest sense in ordinary English, the compound naturally arrived with both, and the name Pinewood is recorded as coming from the common noun.
來源資料把它的由來寫成 pine + wood，是一個很直白的複合字。因為 wood 這一半在日常英文裡本來就同時有「木料」和「小樹林」兩個意思，所以合起來的 pinewood 一出生就帶著兩個意思。片廠的名字 Pinewood 也被記成是從這個普通名詞來的。
Wiktionary, "pinewood"
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