lead time vs interval

lead time and interval both are nouns.

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

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

lead time: the time interval between the initiation and the completion of a production process
interval: a definite length of time marked off by two instants

Other hypernyms of lead time include time interval.

lead time (noun)	interval (noun)
the time interval between the initiation and the completion of a production process	the distance between things
	a set containing all points (or all real numbers) between two given endpoints
	the difference in pitch between two notes
	a definite length of time marked off by two instants