come round vs come around

come round and come around both are verbs.

Word	Noun	Adjective	Verb	Adverb
come round	No	No	Yes	No
come around	No	No	Yes	No

As verbs, come round and come around are synonyms defined as:

come round (verb)	come around (verb)
change one's position or opinion	happen regularly
	change one's position or opinion