Here are some other related words:
* भ्रात्र (bhrātr): brotherly, fraternal
* भ्रात्री (bhrātṛī): brother (in a general sense)
* अनुज (anuj): younger brother
* जेष्ठ (jeṣṭha): elder brother
* सहोदर (sahodar): brother (born of the same parents)
It's important to note that Sanskrit is a rich language with nuances in meaning. The specific word you choose might depend on the context and the specific relationship between the brothers.