- grade, level, tier - a relative position or degree of value in a graded group; "lumber of the highest grade"
--1 is a kind of rank
--1 has particulars: biosafety level; A level; O level; college level - tier - any one of two or more competitors who tie one another
--2 is a kind of rival, challenger, competitor, competition, contender
Derived form: verb tie2 - tier, tier up - a worker who ties something
--3 is a kind of worker
Derived form: verb tie1 - tier - something that is used for tying; "the sail is fastened to the yard with tiers"
--4 is a kind of rope
Derived form: verb tie1 - tier - one of two or more layers one atop another; "tier upon tier of huge casks"; "a three-tier wedding cake"
--5 is a kind of layer, bed