eld vs dotage

eld and dotage both are nouns.

Word	Noun	Adjective	Verb	Adverb
eld	Yes	No	No	No
dotage	Yes	No	No	No

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

eld: a late time of life
dotage: mental infirmity as a consequence of old age; sometimes shown by foolish infatuations

Other hyponyms of eld include second childhood, senility, autumn years, decrepitude.

eld (noun)	dotage (noun)
a late time of life	mental infirmity as a consequence of old age; sometimes shown by foolish infatuations
a time of life (usually defined in years) at which some particular qualification or power arises