light-hearted vs lightsome

light-hearted and lightsome both are adjectives.

Word	Noun	Adjective	Verb	Adverb
light-hearted	No	Yes	No	No
lightsome	No	Yes	No	No

As adjectives, light-hearted and lightsome are synonyms defined as:

Other synonyms of light-hearted include blithe, blithesome, lighthearted.

light-hearted (adjective)	lightsome (adjective)
carefree and happy and lighthearted	carefree and happy and lighthearted
	moving easily and quickly; nimble