entombment vs inhumation

entombment and inhumation both are nouns.

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

As nouns, entombment and inhumation are synonyms defined as:

Other synonyms of entombment include burial, interment, sepulture.

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