tier (n.)
- array
- articulation
- band
- bank
- bed
- bedding
- belt
- buzz
- category
- catena
- catenation
- chain
- concatenation
- connection
- continuum
- course
- cycle
- deck
- descent
- drone
- echelon
- file
- filiation
- floor
- gallery
- gamut
- gradation
- grade
- group
- grouping
- hum
- layer
- league
- ledge
- level
- line
- lineage
- measures
- monotone
- nexus
- order
- overlayer
- pendulum
- periodicity
- pigeonhole
- plenum
- progression
- queue
- range
- rank
- recurrence
- reticulation
- rotation
- round
- routine
- row
- run
- scale
- seam
- sequence
- series
- shelf
- spectrum
- stage
- step
- story
- stratum
- string
- substratum
- succession
- superstratum
- swath
- thickness
- thread
- topsoil
- train
- zone
