stalwart vs robust

stalwart is a noun but robust is not a noun.

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

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

stalwart (adjective)	robust (adjective)
used especially of persons	sturdy and strong in form, constitution, or construction
dependable	strong enough to withstand or overcome intellectual challenges or adversity
having rugged physical strength; inured to fatigue or hardships	marked by richness and fullness of flavor
	rough and crude