interment vs entombment

interment and entombment both are nouns.

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

As nouns, interment and entombment are synonyms defined as:

Other synonyms of interment include burial, inhumation, sepulture.

interment (noun)	entombment (noun)
the ritual placing of a corpse in a grave	the ritual placing of a corpse in a grave