chow line vs waiting line

chow line and waiting line both are nouns.

Word	Noun	Adjective	Verb	Adverb
chow line	Yes	No	No	No
waiting line	Yes	No	No	No

As nouns, waiting line is a hypernym of chow line; that is, waiting line is a word with a broader meaning than chow line:

chow line: a queue of people waiting for food to be served (especially at a military camp)
waiting line: a line of people or vehicles waiting for something

Other hypernyms of chow line include queue.

chow line (noun)	waiting line (noun)
a queue of people waiting for food to be served (especially at a military camp)	a line of people or vehicles waiting for something