load down vs laden

load down is not an adjective while laden is an adjective.

Word	Noun	Adjective	Verb	Adverb
load down	No	No	Yes	No
laden	No	Yes	Yes	No

As verbs, laden is a hypernym of load down; that is, laden is a word with a broader meaning than load down:

Other hypernyms of load down include lade, load, load up.

load down (adjective)	laden (adjective)
	burdened psychologically or mentally
	filled with a great quantity

load down (verb)	laden (verb)
load with a pack	remove with or as if with a ladle
	fill or place a load on