heir vs progeny

heir and progeny both are nouns.

Word	Noun	Adjective	Verb	Adverb
heir	Yes	No	No	No
progeny	Yes	No	No	No

As nouns, progeny is a hypernym of heir; that is, progeny is a word with a broader meaning than heir:

Other hypernyms of heir include issue, offspring.

heir (noun)	progeny (noun)
a person who is entitled by law or by the terms of a will to inherit the estate of another	the immediate descendants of a person
a person who inherits some title or office