drydock vs dry-dock

drydock is a noun but dry-dock is not a noun.

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

As verbs, drydock and dry-dock are synonyms defined as:

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

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