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

Yes

The word "ruas" has the same meaning, spelling, and grammatical function in both Brazilian and Continental Portuguese. The only difference lies in pronunciation:

• Brazilian Portuguese: The vowels are typically more "open," and the final "s" is pronounced as a clear [s] sound (like the "s" in "sun").
• Continental Portuguese: The vowels are more "closed" or reduced, and the final "s" is pronounced as a "sh" sound [ʃ] (like the "sh" in "shoe").

Brazilian Portuguese Examples

1. Gosto de caminhar pelas ruas do centro. (I like to walk through the streets of downtown.)
2. As ruas de São Paulo são muito movimentadas. (The streets of São Paulo are very busy.)
3. Eu me perdi nas ruas da cidade. (I got lost in the streets of the city.)
4. As ruas estavam cheias de lixo após a festa. (The streets were full of trash after the party.)
5. Existem muitas barracas de comida nas ruas. (There are many food stalls in the streets.)

Continental Portuguese Examples

1. Gosto de passear pelas ruas do centro. (I like to stroll through the streets of downtown.)
2. As ruas de Lisboa estão muito movimentadas. (The streets of Lisbon are very busy.)
3. Perdi-me nas ruas da cidade. (I lost myself/got lost in the streets of the city.)
4. As ruas ficaram cheias de lixo depois da festa. (The streets became full of trash after the party.)
5. Há muitos vendedores de comida nas ruas. (There are many food vendors in the streets.)