flee vs desert

flee is not a noun while desert is a noun.

Word	Noun	Adjective	Verb	Adverb
flee	No	No	Yes	No
desert	Yes	No	Yes	No

As verbs, desert is a hyponym of flee; that is, desert is a word with a more specific, narrower meaning than flee:

flee: run away quickly
desert: desert (a cause, a country or an army), often in order to join the opposing cause, country, or army

flee (noun)	desert (noun)
	arid land with little or no vegetation
	(usually plural) a person's deservingness of or entitlement to reward or punishment

flee (verb)	desert (verb)
run away quickly	leave someone who needs or counts on you; leave in the lurch
	leave behind
	desert (a cause, a country or an army), often in order to join the opposing cause, country, or army