lotto vs keno

lotto and keno both are nouns.

Word	Noun	Adjective	Verb	Adverb
lotto	Yes	No	No	No
keno	Yes	No	No	No

As nouns, lotto and keno are synonyms defined as:

lotto and keno: a game in which numbered balls are drawn at random and players cover the corresponding numbers on their cards

Other synonyms of lotto include beano, bingo.

lotto (noun)	keno (noun)
a game in which numbered balls are drawn at random and players cover the corresponding numbers on their cards	a game in which numbered balls are drawn at random and players cover the corresponding numbers on their cards