rapidity vs expedition

rapidity and expedition both are nouns.

Word	Noun	Adjective	Verb	Adverb
rapidity	Yes	No	No	No
expedition	Yes	No	No	No

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

rapidity (noun)	expedition (noun)
a rate that is rapid	a journey organized for a particular purpose
	a military campaign designed to achieve a specific objective in a foreign country
	a journey taken for pleasure
	the property of being prompt and efficient
	an organized group of people undertaking a journey for a particular purpose