- multistorey post
- multitier estuary
- multitier post
- multitorus tank
- multiuse building
- municipal center
- municipal engineering
- municipal highway
- municipal lands
- muntz metal
- muscovite granite
- mushroom construction
- mushroom slab
- musical
- mystic
- mystical
- N-truss
- nail arch
- nail claw
- nail driver
- nail heat
- nail plate
- nail punch
- nail spacing
- nail together
- nailable
- nailed beam
- nailer
- nailing
- nailplate connector
- naivety
- naked light
- naked wall
- naos
- Naples yellow
- nappe inlier
- narrow
- narrow gauge
- narrow track
- narthex
- national aspect
- national highway
- national park
- national planning
- native asphalt
- natural ageing
- natural aggregate
- natural basin
- natural calamity
- natural cement
- natural channel
- natural condition
- natural depth
- natural draft
- natural drying
- natural exposure
- natural feed
- natural foundation
- natural ground
- natural inwash
- natural lake
- natural lighting
- natural period
- natural radiation
- natural anhydrite
- natural axes
- natural conservation
- natural disaster
- natural drainage
- natural feeding
- natural lime
- natural marl
- natural preservation
- natural pulsation
- natural resin
- Natural resources
- natural runoff
- natural scour
- natural stone
- natural turpentine
- nature
- nature reserve
- nautical chart
- nautical mile
- navigable canal
- navigable river
- navigation dam
- navigation key
- navigation light
- navigation lock
- navigational clearance
- neap-tide
- neat cement
- neat line
- necessary mineral
- neck moulding
- necking
- needle beam
- needle gate
- needle valve