burthen vs loading

burthen and loading both are nouns.

Word	Noun	Adjective	Verb	Adverb
burthen	Yes	No	Yes	No
loading	Yes	No	No	No

As nouns, loading is a hypernym of burthen; that is, loading is a word with a broader meaning than burthen:

Other hypernyms of burthen include burden, load.

burthen (noun)	loading (noun)
a variant of `burden'	the labor of putting a load of something on or in a vehicle or ship or container etc.
	goods carried by a large vehicle
	weight to be borne or conveyed
	a quantity that can be processed or transported at one time
	the ratio of the gross weight of an airplane to some factor determining its lift

burthen (verb)	loading (verb)
weight down with a load