tuba

1. A large, valved, brass wind instrument with a bass pitch.

2. A reed stop in an organ, having eight-foot pitch.

3. A large low-pitched brass instrument usually oval in shape and having a conical tube, a cup-shaped mouthpiece, and a usual range an octave lower than that of the euphonium.

Here are some other words you could make with the letters tuba, you can also
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Top Words by points	Points	Word Game
abut	6	Scrabble

2 Letters	Scrabble® Points
ab	4
at	2
ba	4
ta	2
ut	2

3 Letters	Scrabble® Points
bat	5
but	5
tab	5
tau	3
tub	5
uta	3

4 Letters	Scrabble® Points
abut	6
tabu	6
tuba	6