accident vs lottery

accident and lottery both are nouns.

Word	Noun	Adjective	Verb	Adverb
accident	Yes	No	No	No
lottery	Yes	No	No	No

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

accident: anything that happens suddenly or by chance without an apparent cause
lottery: something that is regarded as a chance event

Other hyponyms of accident include hap, break, good luck, happy chance, coincidence, happenstance.

accident (noun)	lottery (noun)
anything that happens suddenly or by chance without an apparent cause	players buy (or are given) chances and prizes are distributed by casting lots
an unfortunate mishap; especially one causing damage or injury	something that is regarded as a chance event