rubber-necking vs looking at

rubber-necking and looking at both are nouns.

Word	Noun	Adjective	Verb	Adverb
rubber-necking	Yes	No	No	No
looking at	Yes	No	No	No

As nouns, looking at is a hypernym of rubber-necking; that is, looking at is a word with a broader meaning than rubber-necking:

rubber-necking: going about to look at places of interest
looking at: the act of directing the eyes toward something and perceiving it visually; look

Other hypernyms of rubber-necking include look, looking.

rubber-necking (noun)	looking at (noun)
going about to look at places of interest	the act of directing the eyes toward something and perceiving it visually; look