crossing vs travelling

crossing and travelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossing	Yes	No	No	No
travelling	Yes	No	No	No

As nouns, travelling is a hypernym of crossing; that is, travelling is a word with a broader meaning than crossing:

Other hypernyms of crossing include travel, traveling.

crossing (noun)	travelling (noun)
a voyage across a body of water (usually across the Atlantic Ocean)	the act of going from one place to another
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