lag vs time interval

lag and time interval both are nouns.

Word	Noun	Adjective	Verb	Adverb
lag	Yes	No	Yes	No
time interval	Yes	No	No	No

As nouns, time interval is a hypernym of lag; that is, time interval is a word with a broader meaning than lag:

Other hypernyms of lag include interval.

lag (noun)	time interval (noun)
the act of slowing down or falling behind	a definite length of time marked off by two instants
one of several thin slats of wood forming the sides of a barrel or bucket
the time between one event, process, or period and another

lag (verb)	time interval (verb)
throw or pitch at a mark, as with coins
cover with lagging to prevent heat loss
hang (back) or fall (behind) in movement, progress, development, etc.
lock up or confine, in or as in a jail