bait and switch vs selling

bait and switch and selling both are nouns.

Word	Noun	Adjective	Verb	Adverb
bait and switch	Yes	No	No	No
selling	Yes	No	No	No

As nouns, selling is a hypernym of bait and switch; that is, selling is a word with a broader meaning than bait and switch:

bait and switch: a deceptive way of selling that involves advertising a product at a very low price in order to attract customers who are then persuaded to switch to a more expensive product
selling: the exchange of goods for an agreed sum of money

Other hypernyms of bait and switch include marketing, merchandising.

bait and switch (noun)	selling (noun)
a deceptive way of selling that involves advertising a product at a very low price in order to attract customers who are then persuaded to switch to a more expensive product	the exchange of goods for an agreed sum of money