up on vs abreast

up on and abreast both are adjectives.

Word	Noun	Adjective	Verb	Adverb
up on	No	Yes	No	No
abreast	No	Yes	No	Yes

As adjectives, up on and abreast are synonyms defined as:

up on and abreast: being up to particular standard or level especially in being up to date in knowledge

Other synonyms of up on include au courant, au fait.

up on (adjective)	abreast (adjective)
being up to particular standard or level especially in being up to date in knowledge	being up to particular standard or level especially in being up to date in knowledge

up on (adverb)	abreast (adverb)
	alongside each other, facing in the same direction