dry dock vs graving dock

dry dock and graving dock both are nouns.

Word	Noun	Adjective	Verb	Adverb
dry dock	Yes	No	No	No
graving dock	Yes	No	No	No

As nouns, dry dock and graving dock are synonyms defined as:

dry dock and graving dock: a large dock from which water can be pumped out; used for building ships or for repairing a ship below its waterline

Other synonyms of dry dock include drydock.

dry dock (noun)	graving dock (noun)
a large dock from which water can be pumped out; used for building ships or for repairing a ship below its waterline	a large dock from which water can be pumped out; used for building ships or for repairing a ship below its waterline