lunule vs half-moon

lunule and half-moon both are nouns.

Word	Noun	Adjective	Verb	Adverb
lunule	Yes	No	No	No
half-moon	Yes	No	No	No

As nouns, lunule and half-moon are synonyms defined as:

lunule and half-moon: the crescent-shaped area at the base of the human fingernail

Other synonyms of lunule include lunula.

lunule (noun)	half-moon (noun)
the crescent-shaped area at the base of the human fingernail	the crescent-shaped area at the base of the human fingernail
	the time at which the Moon is at first or last quarter when half its face is illuminated