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Explanation: I assume that, since you asked for the English for *hêtre*, you are still looking for trees, not actions.
Here is the English for *tremble*, from Termium:
Types of Wood
aspen s CORRECT,NOUN
DEF - any of several poplars (esp. Populus tremula of Europe and P. tremuloides and P. grandidentata of No. America) the leaves of which flutter in the lightest wind on account of their flattened petioles. s