sailing vs seafaring

sailing and seafaring both are nouns.

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

As nouns, seafaring is a hypernym of sailing; that is, seafaring is a word with a broader meaning than sailing:

Other hypernyms of sailing include water travel.

As nouns, sailing and seafaring are synonyms defined as:

Other synonyms of sailing include navigation.

sailing (noun)	seafaring (noun)
riding in a sailboat	the work of a sailor
the work of a sailor	travel by water
the departure of a vessel from a port
the activity of flying a glider

sailing (adjective)	seafaring (adjective)
	used on the high seas