is a specific kind of: being, organism.

is a broader term that covers: monad | intestinal flora | virus | moneran, moneron | bacteria, bacterium | bug, germ, microbe | pathogen | protoctist | protist, protistan | microflora.

has as a part: pilus.

domain category: animal, animate being, beast, brute, creature, fauna | flora, plant, plant life.

domain member category: virulence, virulency | transmitter, vector | bacteremia, bacteriaemia, bacteriemia | highly infective | motile | immotile, nonmotile.