Both Uses

analogy
in
Do You Speak American?
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Perhaps that is an unfortunate analogy, since the barbarians eventually overran the Romans, and Latin, the language of empire, evolved into the many separate Romance languages.†
Chpt 3 *

analogy = a comparison of different things to point to a shared characteristic
We asked one of the committee members, Calvin Gibson, who is African American, whether using queer themselves was analogous to blacks' using nigger but being offended if white people did.†
Chpt 7

analogous = similar in some respect

Definitions:

(1) (analogy)
a comparison of different things to point to a shared characteristic

Analogies are typically used to explain something unfamiliar by comparing it to something that is simpler or more familiar. They are also used in argument to suggest that what is true for one situation is also true in the other.
(2) (meaning too rare to warrant focus)