burial vs interment

burial and interment both are nouns.

Word	Noun	Adjective	Verb	Adverb
burial	Yes	No	No	No
interment	Yes	No	No	No

As nouns, burial and interment are synonyms defined as:

Other synonyms of burial include entombment, inhumation, sepulture.

burial (noun)	interment (noun)
concealing something under the ground	the ritual placing of a corpse in a grave
the ritual placing of a corpse in a grave