emulsion vs degras

emulsion and degras both are nouns.

Word	Noun	Adjective	Verb	Adverb
emulsion	Yes	No	No	No
degras	Yes	No	No	No

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

emulsion: (chemistry) a colloid in which both phases are liquids
degras: a semisolid emulsion produced by the treatment of certain skins with oxidized fish oil, which extracts their soluble albuminoids.

emulsion (noun)	degras (noun)
a light-sensitive coating on paper or film; consists of fine grains of silver bromide suspended in a gelatin	a semisolid emulsion produced by the treatment of certain skins with oxidized fish oil, which extracts their soluble albuminoids.
(chemistry) a colloid in which both phases are liquids