eld vs legal age

eld and legal age both are nouns.

Word	Noun	Adjective	Verb	Adverb
eld	Yes	No	No	No
legal age	Yes	No	No	No

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

eld: a time of life (usually defined in years) at which some particular qualification or power arises
legal age: the age at which persons are considered competent to manage their own affairs

Other hyponyms of eld include age of consent, majority, minority, nonage, drinking age, voting age.

eld (noun)	legal age (noun)
a late time of life	the age at which persons are considered competent to manage their own affairs
a time of life (usually defined in years) at which some particular qualification or power arises