Bacilli and Bacteria

Bacteria and bacilli are semantically related In some cases you can use "Bacteria" instead a noun "Bacilli".

Bacteria noun - (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants.

Bacilli and bacteria are semantically related in microorganisms topic. You can use "Bacilli" instead a noun "Bacteria".