worrier vs worrywart

worrier and worrywart both are nouns.

Word	Noun	Adjective	Verb	Adverb
worrier	Yes	No	No	No
worrywart	Yes	No	No	No

As nouns, worrier and worrywart are synonyms defined as:

worrier and worrywart: thinks about unfortunate things that might happen

Other synonyms of worrier include fuss-budget, fusspot.

worrier (noun)	worrywart (noun)
thinks about unfortunate things that might happen	thinks about unfortunate things that might happen