point duty vs traffic control

point duty and traffic control both are nouns.

Word	Noun	Adjective	Verb	Adverb
point duty	Yes	No	No	No
traffic control	Yes	No	No	No

As nouns, traffic control is a hypernym of point duty; that is, traffic control is a word with a broader meaning than point duty:

point duty: the control of traffic by a policeman stationed at an intersection
traffic control: control of the flow of traffic in a building or a city

point duty (noun)	traffic control (noun)
the control of traffic by a policeman stationed at an intersection	control of the flow of traffic in a building or a city