load-bearing vs supporting

load-bearing is not a noun while supporting is a noun.

Word	Noun	Adjective	Verb	Adverb
load-bearing	No	Yes	No	No
supporting	Yes	Yes	No	No

As adjectives, load-bearing and supporting are synonyms defined as:

load-bearing (noun)	supporting (noun)
	the act of bearing the weight of or strengthening

load-bearing (adjective)	supporting (adjective)
capable of bearing a structural load	capable of bearing a structural load
	furnishing support and encouragement