appearance vs emersion

appearance and emersion both are nouns.

Word	Noun	Adjective	Verb	Adverb
appearance	Yes	No	No	No
emersion	Yes	No	No	No

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

Other hyponyms of appearance include apparition, emergence, reappearance, return.

appearance (noun)	emersion (noun)
the act of appearing in public view	the act of emerging
formal attendance (in court or at a hearing) of a party in an action	(astronomy) the reappearance of a celestial body after an eclipse
pretending that something is the case in order to make a good impression
outward or visible aspect of a person or thing
a mental representation
the event of coming into sight