weariness vs jet lag

weariness and jet lag both are nouns.

Word	Noun	Adjective	Verb	Adverb
weariness	Yes	No	No	No
jet lag	Yes	No	No	No

As nouns, jet lag is a hyponym of weariness; that is, jet lag is a word with a more specific, narrower meaning than weariness:

weariness: temporary loss of strength and energy resulting from hard physical or mental work
jet lag: fatigue and sleep disturbance resulting from disruption of the body's normal circadian rhythm as a result of jet travel

Other hyponyms of weariness include asthenopia, eyestrain, exhaustion, grogginess, logginess, loginess, senioritis.

weariness (noun)	jet lag (noun)
temporary loss of strength and energy resulting from hard physical or mental work	fatigue and sleep disturbance resulting from disruption of the body's normal circadian rhythm as a result of jet travel