custom-made vs custom-built

custom-made and custom-built both are nouns.

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

As nouns, custom-made and custom-built are synonyms defined as:

custom-made and custom-built: an item made to the customer's specifications

custom-made (noun)	custom-built (noun)
an item made to the customer's specifications	an item made to the customer's specifications

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