light-hearted vs blithesome

light-hearted and blithesome both are adjectives.

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

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

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

light-hearted (adjective)	blithesome (adjective)
carefree and happy and lighthearted	carefree and happy and lighthearted