default judgment vs judgment by default

default judgment and judgment by default both are nouns.

Word	Noun	Adjective	Verb	Adverb
default judgment	Yes	No	No	No
judgment by default	Yes	No	No	No

As nouns, default judgment and judgment by default are synonyms defined as:

default judgment and judgment by default: a judgment entered in favor of the plaintiff when the defendant defaults (fails to appear in court)

Other synonyms of default judgment include default judgement, judgement by default.

default judgment (noun)	judgment by default (noun)
a judgment entered in favor of the plaintiff when the defendant defaults (fails to appear in court)	a judgment entered in favor of the plaintiff when the defendant defaults (fails to appear in court)