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

Yes

The meaning, spelling, and grammar of the word "rainha" are identical in both Brazilian and Continental Portuguese. The only differences are found in pronunciation.

In Brazil, vowels are typically more "open" and clearly articulated, giving the word a more melodic, rhythmic quality. In Portugal, unstressed vowels are often "reduced" or swallowed (a phenomenon called vowel reduction), which can make the word sound more clipped or "closed" to a Brazilian ear. Additionally, the rhythm of Brazilian Portuguese is more syllable-timed, whereas Continental Portuguese is more stress-timed.

Brazilian Portuguese Examples

1. A rainha da Inglaterra está visitando o Brasil. (The Queen of England is visiting Brazil.)
2. Ela é a rainha do meu coração. (She is the queen of my heart.)
3. Você se comporta como uma verdadeira rainha. (You behave like a true queen.)
4. A rainha chegou ao palácio muito cedo. (The queen arrived at the palace very early.)
5. Ela é considerada a rainha do pop. (She is considered the queen of pop.)

Continental Portuguese Examples

1. A rainha da Inglaterra está a visitar o Brasil. (The Queen of England is visiting Brazil.)
2. Ela é a rainha do meu coração. (She is the queen of my heart.)
3. Tu comportas-te como uma verdadeira rainha. (You behave like a true queen.)
4. A rainha chegou ao palácio muito cedo. (The queen arrived at the palace very early.)
5. Ela é considerada a rainha do pop. (She is considered the queen of pop.)