BWA, or Burrows-Wheeler Aligner, "is a software package for mapping low-divergent sequences against a large reference genome, such as the human genome" (BWA homepage).
The below can be used to view all of the installations of BWA on a particular system, where this example uses Coeus.
$ module avail |& grep -i "bwa"
Biosciences/bwa/0.7.12/gcc-7.2.0
To invoke BWA's primary binary, use the below. For more on using BWA, refer to here.
$ module load Biosciences/bwa/0.7.12/gcc-7.2.0
$ bwa