postpaid vs paid

postpaid and paid both are adjectives.

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

postpaid (adjective)	paid (adjective)
used especially of mail; paid in advance	marked by the reception of pay
	involving gainful employment in something often done as a hobby
	yielding a fair profit