Is the clarinet like base clarinet?

No, the clarinet and the bass clarinet are different instruments. The clarinet is a single-reed woodwind instrument, while the bass clarinet is a larger, lower-pitched member of the clarinet family. The clarinet is typically pitched in B♭, while the bass clarinet is pitched in B♭ an octave lower. The clarinet has a range of about three and a half octaves, while the bass clarinet has a range of about three octaves. The clarinet is a transposing instrument, meaning that the written notes sound a step lower than they are written, while the bass clarinet is a non-transposing instrument, meaning that the written notes sound at the same pitch as they are written.