au courant vs abreast

au courant and abreast both are adjectives.

Word	Noun	Adjective	Verb	Adverb
au courant	No	Yes	No	No
abreast	No	Yes	No	Yes

As adjectives, au courant and abreast are synonyms defined as:

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

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

au courant (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

au courant (adverb)	abreast (adverb)
	alongside each other, facing in the same direction