mass vs fecalith

mass and fecalith both are nouns.

Word	Noun	Adjective	Verb	Adverb
mass	Yes	Yes	Yes	No
fecalith	Yes	No	No	No

As nouns, fecalith is a hyponym of mass; that is, fecalith is a word with a more specific, narrower meaning than mass:

Other hyponyms of mass include coprolith, faecalith, stercolith, drift, mat, mush, pulp.

mass (noun)	fecalith (noun)
the property of a body that causes it to have weight in a gravitational field	a hard mass of fecal matter
the property of something that is great in magnitude
the common people generally
an ill-structured collection of similar things (objects or people)
a body of matter without definite shape
(often followed by `of') a large number or amount or extent

mass (adjective)	fecalith (adjective)
formed of separate units gathered into a mass or whole

mass (verb)	fecalith (verb)
join together into a mass or collect or form a mass