- common knowledge
- common rafter
- common ramp
- common stairway
- communal room
- communication system
- community center
- community centre
- community dwelling
- community lands
- community structure
- commutability
- commutation
- commander
- commemorative architecture
- comment
- commercial building
- commercial correspondence
- commercial hotel
- commercial invoice
- commercial lime
- commercial slabs
- commercial town
- commercial wood
- commingle
- commode step
- common
- common brick
- common carrier
- common embankment
- common mode
- common vent
- commune road
- communicate
- communicating flux
- communication
- communication catellite
- communication center
- communication link
- communication procedure
- communique
- combination trap
- combine footing
- combined reinforcing
- combined support
- combining document
- combo box
- combustible construction
- combustible dust
- combustible material
- comfort cooling
- comfort index
- comfort zone
- comic book
- comic strip
- command button
- command line
- command organizer
- commando
- commemorative column
- commercial bolts
- commercial city
- commercial hall
- commercial iron
- commercial power
- commercial representation
- commercial timber
- commercial zone
- committee room
- commodity product
- common ashlar
- common bond
- common gypsum
- common illumination
- common joist
- compaction ratio
- compactness state
- comparative test
- comparator
- comparison operator
- compartment mill
- compass bowl
- compass geodesy
- compass leg
- compass rafter
- compass rose
- compass traverse
- compensating payment
- compensating reservoir
- compensator
- compensatory payment
- competitive price
- compile hour
- complete hinge
- complete rupture
- complete subsidence
- completed project
- completing products
- completion list
- complex busbar