dominoes vs dominos

dominoes and dominos both are nouns.

Word	Noun	Adjective	Verb	Adverb
dominoes	Yes	No	No	No
dominos	Yes	No	No	No

As nouns, dominoes and dominos are synonyms defined as:

dominoes and dominos: any of several games played with small rectangular blocks

dominoes (noun)	dominos (noun)
any of several games played with small rectangular blocks	any of several games played with small rectangular blocks