drydock vs dry dock

drydock and dry dock both are nouns.

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

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

drydock and dry 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 drydock include graving dock.

drydock (noun)	dry 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

drydock (verb)	dry dock (verb)
maneuver (a ship) into a drydock