punctual vs on time

punctual and on time both are adjectives.

Word	Noun	Adjective	Verb	Adverb
punctual	No	Yes	No	No
on time	No	Yes	No	Yes

As adjectives, punctual and on time are synonyms defined as:

punctual and on time: acting or arriving or performed exactly at the time appointed

punctual (adjective)	on time (adjective)
acting or arriving or performed exactly at the time appointed	acting or arriving or performed exactly at the time appointed
	payable in installments within a designated period of time

punctual (adverb)	on time (adverb)
	at the expected or proper time