Synonyms of the word 
NONHIERARCHICAL → UNGRADED - UNORDERED - UNRANKED
nonhierarchical
- adj. Classified or arranged so that a group or person has the same authority as everyone else; not hierarchical.
ungraded
- adj. Not graded; having no grade.
unordered
- adj. Not having been ordered.
- adj. Not in any sorted order.
unranked
- adj. Not ranked.
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