inhumation vs burial

inhumation and burial both are nouns.

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

As nouns, inhumation and burial are synonyms defined as:

Other synonyms of inhumation include entombment, interment, sepulture.

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