stouthearted vs stalwart

stouthearted is not a noun while stalwart is a noun.

Word	Noun	Adjective	Verb	Adverb
stouthearted	No	Yes	No	No
stalwart	Yes	Yes	No	No

As adjectives, stouthearted and stalwart are synonyms defined as:

stouthearted (noun)	stalwart (noun)
	a person who is loyal to their allegiance (especially in times of revolt)

stouthearted (adjective)	stalwart (adjective)
used especially of persons	used especially of persons
	dependable
	having rugged physical strength; inured to fatigue or hardships