dosage vs tablet

dosage and tablet both are nouns.

Word	Noun	Adjective	Verb	Adverb
dosage	Yes	No	No	No
tablet	Yes	No	No	No

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

dosage (noun)	tablet (noun)
a measured portion of medicine taken at any one time	a dose of medicine in the form of a small pellet
the quantity of an active agent (substance or radiation) taken in or absorbed at any one time	a small flat compressed cake of some substance
	a slab of stone or wood suitable for bearing an inscription
	a portable computer with a touchscreen
	a number of sheets of paper fastened together along one edge