Yes, samba is a Scrabble word!

Verb

1. Dance the samba

Noun

1. Large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood

2. Music composed for dancing the samba

3. A lively ballroom dance from Brazil

4. A form of canasta using three decks of cards and six jokers