duration vs time scale

duration and time scale both are nouns.

Word	Noun	Adjective	Verb	Adverb
duration	Yes	No	No	No
time scale	Yes	No	No	No

As nouns, time scale is a hyponym of duration; that is, time scale is a word with a more specific, narrower meaning than duration:

Other hyponyms of duration include clocking, longueur, residence time, span, stint, stretch, note value, time value, value, rule.

duration (noun)	time scale (noun)
continuance in time	an arrangement of events used as a measure of duration
the property of enduring or continuing in time
the period of time during which something continues