gainful vs paid

gainful and paid both are adjectives.

Word	Noun	Adjective	Verb	Adverb
gainful	No	Yes	No	No
paid	No	Yes	No	No

As adjectives, gainful and paid are synonyms defined as:

Other synonyms of gainful include paying.

gainful (adjective)	paid (adjective)
yielding a fair profit	marked by the reception of pay
	involving gainful employment in something often done as a hobby
	yielding a fair profit