half mask vs domino

half mask and domino both are nouns.

Word	Noun	Adjective	Verb	Adverb
half mask	Yes	No	No	No
domino	Yes	No	No	No

As nouns, half mask and domino are synonyms defined as:

half mask and domino: a mask covering the upper part of the face but with holes for the eyes

Other synonyms of half mask include eye mask.

half mask (noun)	domino (noun)
a mask covering the upper part of the face but with holes for the eyes	a small rectangular block used in playing the game of dominoes; the face of each block has two equal areas that can bear 0 to 6 dots
	a mask covering the upper part of the face but with holes for the eyes
	a loose hooded cloak worn with a half mask as part of a masquerade costume