span vs viaduct

viaduct vs span

span and viaduct both are nouns.

span is a verb but viaduct is not a verb.

Word	Noun	Adjective	Verb	Adverb
span	Yes	No	Yes	No
viaduct	Yes	No	No	No

As nouns, viaduct is a hyponym of span; that is, viaduct is a word with a more specific, narrower meaning than span:

span: a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
viaduct: bridge consisting of a series of arches supported by piers used to carry a road (or railroad) over a valley

Other hyponyms of span include Bailey bridge, cantilever bridge, cattle grid, cattle guard, covered bridge, drawbridge, lift bridge, footbridge, overcrossing, pedestrian bridge, flyover, overpass, bateau bridge, floating bridge, pontoon bridge, rope bridge, steel arch bridge, suspension bridge, toll bridge, trestle bridge, truss bridge.

span (noun)	viaduct (noun)
the act of sitting or standing astride	bridge consisting of a series of arches supported by piers used to carry a road (or railroad) over a valley
a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
the distance or interval between two points
a unit of length based on the width of the expanded human hand (usually taken as 9 inches)
two items of the same kind
the complete duration of something

span (verb)	viaduct (verb)
to cover or extend over an area or time period

Difference between span and viaduct

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