part-time vs part time

part-time and part time both are adjectives.

Word	Noun	Adjective	Verb	Adverb
part-time	No	Yes	No	Yes
part time	No	Yes	No	No

As adjectives, part-time and part time are synonyms defined as:

part-time and part time: involving less than the standard or customary time for an activity

part-time (adjective)	part time (adjective)
involving less than the standard or customary time for an activity	involving less than the standard or customary time for an activity

part-time (adverb)	part time (adverb)
for less than the standard number of hours