sailing vs navigation

sailing and navigation both are nouns.

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

As nouns, sailing and navigation are synonyms defined as:

Other synonyms of sailing include seafaring.

sailing (noun)	navigation (noun)
riding in a sailboat	the guidance of ships or airplanes from place to place
the work of a sailor	the work of a sailor
the departure of a vessel from a port	ship traffic
the activity of flying a glider