• categorise
• taxonomic group
• educational activity
• instruction
• categorize
• class ciliophora
• ascomycetes
• class diplopoda
• subclass heterobasidiomycetes
• industrial arts

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