keep on vs retain

keep on and retain both are verbs.

Word	Noun	Adjective	Verb	Adverb
keep on	No	No	Yes	No
retain	No	No	Yes	No

As verbs, keep on and retain are synonyms defined as:

keep on and retain: allow to remain in a place or position or maintain a property or feature

Other synonyms of keep on include continue, keep.

keep on (verb)	retain (verb)
allow to remain in a place or position or maintain a property or feature	keep in one's mind
	secure and keep for possible future use or application
	allow to remain in a place or position or maintain a property or feature
	hold back within