cargo ships vs shipping

cargo ships and shipping both are nouns.

Word	Noun	Adjective	Verb	Adverb
cargo ships	Yes	No	No	No
shipping	Yes	No	No	No

As nouns, cargo ships and shipping are synonyms defined as:

cargo ships and shipping: conveyance provided by the ships belonging to one country or industry

Other synonyms of cargo ships include merchant marine, merchant vessels.

cargo ships (noun)	shipping (noun)
conveyance provided by the ships belonging to one country or industry	the commercial enterprise of moving goods and materials
	conveyance provided by the ships belonging to one country or industry