slip away vs progress

slip away is not a noun while progress is a noun.

Word	Noun	Adjective	Verb	Adverb
slip away	No	No	Yes	No
progress	Yes	No	Yes	No

As verbs, progress is a hypernym of slip away; that is, progress is a word with a broader meaning than slip away:

Other hypernyms of slip away include advance, go on, march on, move on, pass on.

slip away (noun)	progress (noun)
	the act of moving forward (as toward a goal)
	gradual improvement or growth or development
	a movement forward

slip away (verb)	progress (verb)
for time to move forward	develop in a positive way
leave furtively and stealthily	form or accumulate steadily
	move forward, also in the metaphorical sense