crossing vs genetic science

crossing and genetic science both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossing	Yes	No	No	No
genetic science	Yes	No	No	No

crossing (noun)	genetic science (noun)
a voyage across a body of water (usually across the Atlantic Ocean)	the branch of biology that studies heredity and variation in organisms
traveling across
(genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other
a junction where one street or road crosses another
a point where two lines (paths or arcs etc.) intersect
a shallow area in a stream that can be forded