employment vs shape-up

employment and shape-up both are nouns.

Word	Noun	Adjective	Verb	Adverb
employment	Yes	No	No	No
shape-up	Yes	No	No	No

As nouns, shape-up is a hyponym of employment; that is, shape-up is a word with a more specific, narrower meaning than employment:

employment: the act of giving someone a job
shape-up: a way of hiring longshoremen by the day; applicants gather around a union boss who selects those to be hired

Other hyponyms of employment include call-back, booking, reservation.

employment (noun)	shape-up (noun)
the occupation for which you are paid	a way of hiring longshoremen by the day; applicants gather around a union boss who selects those to be hired
the act of using
the act of giving someone a job
the state of being employed or having a job