Is the word árvores the same in Brazilian and European Portuguese?

Yes

The word "árvores" is identical in spelling, meaning, and grammar in both Brazilian and Continental Portuguese. The only significant difference lies in pronunciation:

• Brazilian Portuguese: The vowels are more open and the rhythm is more melodic. The "o" in "árvores" is clearly articulated.
• Continental Portuguese: The vowels are more closed and often reduced. The "o" is frequently "swallowed" or pronounced as a very short, neutralized sound, making it sound almost like "árv'res."

While the word itself does not change, the grammatical structures surrounding it often differ between the two regions (such as the use of the gerund in Brazil versus the preposition "a" + infinitive in Portugal).

Brazilian Portuguese Examples

1. Tem muitas árvores no parque. (There are many trees in the park.)
2. As árvores estão perdendo as folhas. (The trees are losing their leaves.)
3. Eu gosto de descansar debaixo das árvores. (I like to rest under the trees.)
4. As árvores frutíferas estão carregadas de frutas. (The fruit trees are laden with fruit.)
5. As árvores do meu quintal são muito grandes. (The trees in my backyard are very large.)

Continental Portuguese Examples

1. Há muitas árvores no parque. (There are many trees in the park.)
2. As árvores estão a perder as folhas. (The trees are losing their leaves.)
3. Gosto de descansar sob as árvores. (I like to rest under the trees.)
4. As árvores de fruto estão carregadas de fruta. (The fruit trees are laden with fruit.)
5. As árvores do meu quintal são muito grandes. (The trees in my backyard are very large.)