1. Not arranged in order hierarchically
   - ungraded, unordered

See also: nonhierarchic, nonhierarchical

• yellow woman
• yellow-banded
• yellow-beige
• yellow-bellied
• yellow-bellied sapsucker
• yellow-bellied terrapin
• yellow-blindness
• yellow-blue color blindness
• yellow-blue colour blindness
• yellow-blue dichromacy
• yellow-breasted bunting
• yellow-breasted chat
• yellow-brown
• yellow-crowned night heron
• yellow-dog contract
• yellow-eyed grass
• yellow-eyed grass family
• yellow-fever mosquito
• yellow-gray
• yellow-green algae
• yellow-grey
• yellow-leaf sickle pine
• yellow-marked
• yellow-orange
• yellow-shafted flicker