employment vs sailing

employment and sailing both are nouns.

Word	Noun	Adjective	Verb	Adverb
employment	Yes	No	No	No
sailing	Yes	No	No	No

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

employment (noun)	sailing (noun)
the occupation for which you are paid	riding in a sailboat
the act of using	the work of a sailor
the act of giving someone a job	the departure of a vessel from a port
the state of being employed or having a job	the activity of flying a glider