- square
- rectangular
- parallelogram
- box
- quadrilateral
- trapezoid
- diagonal
- rhombus
- squares
- cube
- right angle
- polygon
- oblong
- perpendicular
- lengthwise
- triangles
- translucent
- concave
- expanse
- edges
- foursquare
- shape
- angle
- ellipse
- vertices
- hypotenuse
- parallel
- spherical geometry
- hyperbolic geometry
- elliptic geometry
- rectangles
- convex polygon
- cubes
- diagonally
- cylindrical
- horizontally
- curved
- squared
- wavy
- hexagonal
- horizontal
- spherical
- vertex
- slices
- vertex arrangement
- squareness
- latin
- elongated
- blob
- squarish
- squarely
- bezel
- petals
- semicircle
- vertically
- crescent
- silhouette
- conical
- contour
- quadrate
- lettering
- cutout
- lattice
- orb
- squarewise
- nonsquare
- antiparallelogram
- folds
- quadratic
- edge
- cubic
- geometric
- inch
- textured
- width
- quadrangle
- side
- hexagon
- shaped
- equality
- enclosing
- length
- piazza
- tesseract
- circumference
- trapezoidal
- centimeter
- carapace
- euclidean geometry
- hypercube
- thick
- diameter
- slab
- parabola
- dots
- strips
- stripe
- rect
- micrometre
- octagon
- dough
- spaced
- encloses
- sheaf
- thickness
- layered
- prisms
- slivers
- symmetrical
- wedge
- thin
- serrated
- crosswise
- yellowish
- slice
- whitish
- chunks
- ovoid
- micrometer
- symmetry
- millimeter
- centimetre
- hairs
- gelatinous
- thread
- vertical
- bounding
- 2-inch
- four side
- wrapper
- overlaid
- clump
- 1-inch
- crust
- shaper
- wedge-shaped
- toroidal
- shapen
- square-shaped
- badge
- reshape
- cross-section
- 9-inch
- regular polygon
- boxer
- geometrical
- hypergraph
- pugilistic
- circle
- pugilist
- semicircles
- shapeless
- dodecahedron
- hexagons
- ogee
- indentations
- convex
- polyhedron
- tetrahedron
- umbels
- isosceles
- conic
- flacon
- circlet
- openwork
- lengthways
- octahedron
- cuboid
- figure
- oculus
- gnomon
- selvage
- cruciform
- dimple
- cartouche
- concavity
- spheroid
- lunette
- sconce
- mullions
- pilaster
- pleat
- asterism
- pasteboard
- snuffbox
- rosetta
- casket
- 1/2-inch
- 3-inch
- featherweight
- bandbox
- cardboard
- matchbox
- plaza
- coffer
- crate
- square meal
- boxwood
- multiform
- crescent-shaped
- formation
- degree
- coffin
- cubism
- shapely
- convexity
- reddish-brown
- 3/4-inch
- ring-shaped
- 8-inch
- squircle
- straightness
- preshape
- cone-shaped
- middleweight
- 1/4-inch
- conventional
- blue-black
- morpho
- unshaped
- prizefighter
- 2-kilometer
- topography
- domeshaped
- shapable
- form
- dicebox
- shapelet
- slugger
- angularity
- boxology
- foreshape
- cubelike
- hod
- boxlike
- line
- if and only if
- roughhew
- shapedness
- square circle
- misshape
- supercube
- unshape
- carpenter's square
- figurable
- waveshape
- pugilism
- stashbox
- transhape
- boxful
- embox
- monomorphic
- boist
- buxus
- imbox
- boxout
- autoboxing
- omniform
- boxboard
- overshape
- playbox
- morphic
- userbox
- autoboxed
- geometric figure
- preform
- falciform
- morphous
- farebox
- boxkeeper
- squiggle
- sidebox
- widthwise
- indention
- ramekin
- splodge
- bevels
- octagons
- semitransparent
- serifs
- longways
- crosshatch
- bundt
- floret
- pentagons
- pushpin
- swage
- piecrust
- ladyfingers
- gameboard
- pankration
- tesserae
- checkerboards
- countersink
- stipple
- crenellations
- phyllo
- synclinal
- chamfer
- plasmatic
- nubbin
- bullnose
- efform
- diagonals
- tacklebox
- skybox
- toruffle
- beshape
- abox
- winebox
- shapechanger
- individuate
- letterbox
- shoebox
- milkcrate
- boxball
- rudist
- giftbox
- boxen
- forshape
- feedbox
- malleiform
- square inch
- stompbox
- strongbox
- zoomorphic
- prizefight
- bace
- slipcase
- pancratium
- biformed
- paintbox
- vertex-transitive
- makedom
- boxhaul
- antiform
- boxload
- t square
- ticky box
- on square
- biform
- morphometrics
- aspergilliform
- boxaerobics
- try square
- square up
- translation
- square foot
- reflection symmetry
- rotation
- square yard
- pizza table
- axis of symmetry
- perimeter
- heart shape
- area
- isosceles trapezia
- bisection
- amorphous shape
- cigar box
- t shape
- six side
- cyclic polygon
- square metre
- shadow box
- figure eight
- corner angle
- steel square
- box glove
- box up
- comparability
- ball field
- isosceles triangle
- equilateral triangle
- satin stitch
- triangular prism
- embroidery hoop
- plumb bob
- pancake turner
- greaseproof paper
- gothic arch
- cumulus cloud
- box ring
- darning needle
- apple box
- equiangular polygon
- spatial property
- angular shape
- in loft
- penalty area
- batter's box
- post office box
- po box
- poor box
- ringside seat
- store object
- ballot box
- three dimensional
- town square
- take shape
- box in
- single curve
- pair of shoe
- pack case
- below belt
- edge protector
- symmetry orbit
- box tree
- pandora's box
- pack material
- butterfly
- in form
- rotational symmetry
- reflectional symmetry
- wire
- brickwork
- tessellation
- similarity
- rectilinear polygon
- dual polygon
- three-dimensional
- degrees of freedom
- commensurability
- polyabolo
- isoperimetric theorem
- polyomino
- british flag theorem
- japanese theorem for cyclic quadrilaterals
- homothetic transformation
- inscribed figure
- reflex angle
- bow tie
- interior angle
- great circle
- right triangle
- polygon density
- oval shaped
- space frame
- indentation
- l shaped
- octagonal
- triangle
- featureless
- geometric shapes
- baking dish
- curving
- blobs
- baking pan
- checkerboard
- sloping
- parchment paper
- blocky
- dot
- diagram
- cutouts
- teardrop
- sloped
- bisected
- tiled
- quadrants
- u shaped
- patty
- touchpad
- cookie sheet
- rows
- honeycomb
- shapes
- angular
- cursor
- oval
- trackpad
- undulating
- boxy
- pleats
- contoured
- arches
- shaded
- backlit
- smiley face
- slits
- #.#cm
- elliptical
- alcove
- circular
- silvery
- scroll wheel
- jagged
- baking sheets
- swatches
- puff pastry
- curvature
- contours

That's about all the rectangle related words we've got! I hope this list of rectangle terms was useful to you in some way or another. The words down here at the bottom of the list will be in some way associated with rectangle, but perhaps tenuously (if you've currenly got it sorted by relevance, that is). If you have any feedback for the site, please post it here, but please note this is only a hobby project, so I may not be able to make regular updates to the site. Have a nice day! 🐝