tiredness vs grogginess

tiredness and grogginess both are nouns.

Word	Noun	Adjective	Verb	Adverb
tiredness	Yes	No	No	No
grogginess	Yes	No	No	No

As nouns, grogginess is a hyponym of tiredness; that is, grogginess is a word with a more specific, narrower meaning than tiredness:

tiredness: temporary loss of strength and energy resulting from hard physical or mental work
grogginess: a groggy state resulting from weariness

Other hyponyms of tiredness include asthenopia, eyestrain, jet lag, exhaustion, logginess, loginess, senioritis.

tiredness (noun)	grogginess (noun)
temporary loss of strength and energy resulting from hard physical or mental work	marginal consciousness
	a groggy state resulting from weariness
	a dazed and staggering state caused by alcohol