• taxonomic category
• categorize
• categorise
• education
• didactics
• class oligochaeta
• class charophyceae
• class ginkgophytina
• class pauropoda
• caste

class angiospermae  class act  class actinozoa  class arachnida  class amphibia  class aphasmidia  class anthozoa  class anthoceropsida  class action  class acrasiomycetes