custom-built vs custom

custom-built and custom both are nouns.

Word	Noun	Adjective	Verb	Adverb
custom-built	Yes	Yes	No	No
custom	Yes	Yes	No	No

custom-built (noun)	custom (noun)
an item made to the customer's specifications	accepted or habitual practice
	habitual patronage
	a specific practice of long standing
	money collected under a tariff

custom-built (adjective)	custom (adjective)
built for a particular individual	made according to the specifications of an individual