Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Noun: psittacosaurus Your choice? a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind and short front limbs; may have been bipedal orchid of South and Central America having flowers similar to but smaller than Psychopsis papilio; sometimes placed in genus Oncidium   (Noun: psychopsis krameriana) medium-sized Caucasian much-branched tree distinguished from other walnut trees by its winged fruit   (Noun: pterocarya fraxinifolia)