yearly vs ephemeris

yearly and ephemeris both are nouns.

Word	Noun	Adjective	Verb	Adverb
yearly	Yes	Yes	No	Yes
ephemeris	Yes	No	No	No

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

yearly: a reference book that is published regularly once every year
ephemeris: an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year

Other hyponyms of yearly include almanac, almanac, farmer's calendar.

yearly (noun)	ephemeris (noun)
a reference book that is published regularly once every year	an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year

yearly (adjective)	ephemeris (adjective)
occurring or payable every year

yearly (adverb)	ephemeris (adverb)
without missing a year