crash land vs ditch

crash land is not a noun while ditch is a noun.

Word	Noun	Adjective	Verb	Adverb
crash land	No	No	Yes	No
ditch	Yes	No	Yes	No

As verbs, ditch is a hyponym of crash land; that is, ditch is a word with a more specific, narrower meaning than crash land:

crash land (noun)	ditch (noun)
	a long narrow excavation in the earth
	any small natural waterway

crash land (verb)	ditch (verb)
make an emergency landing	crash or crash-land
	cut a trench in, as for drainage
	make an emergency landing on water
	forsake
	throw away
	sever all ties with, usually unceremoniously or irresponsibly