keep up vs keep step

keep up and keep step both are verbs.

Word	Noun	Adjective	Verb	Adverb
keep up	No	No	Yes	No
keep step	No	No	Yes	No

As verbs, keep step is a hyponym of keep up; that is, keep step is a word with a more specific, narrower meaning than keep up:

Other hyponyms of keep up include keep pace.

keep up (verb)	keep step (verb)
prevent from going to bed at night	maintain the same pace
keep informed
maintain a required pace or level
keep in safety and protect from harm, decay, loss, or destruction
lengthen or extend in duration or space