deuce vs span

deuce and span both are nouns.

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

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

deuce: the cardinal number that is the sum of one and one or a numeral representing this number
span: two items of the same kind

Other hyponyms of deuce include craps, snake eyes, brace, couple, couplet, distich, duad, duet, duo, dyad, pair, twain, twosome, yoke.

deuce (noun)	span (noun)
one of the four playing cards in a deck that have two spots	the act of sitting or standing astride
a word used in exclamations of confusion	a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
the cardinal number that is the sum of one and one or a numeral representing this number	the distance or interval between two points
a tie in tennis or table tennis that requires winning two successive points to win the game	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

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